Add with overflow panic when requested address + len is out of bounds

[ko1N]

When reading at a high address with an appropriate length that would cause an overflow this panic is emitted. It would be better to not panic and just return a specialized Error.

thread '<unnamed>' panicked at 'attempt to add with overflow', memflow/src/types/address.rs:288:16
stack backtrace:
   0: rust_begin_unwind
             at /rustc/53cb7b09b00cbea8754ffb78e7e3cb521cb8af4b/library/std/src/panicking.rs:493:5
   1: core::panicking::panic_fmt
             at /rustc/53cb7b09b00cbea8754ffb78e7e3cb521cb8af4b/library/core/src/panicking.rs:92:14
   2: core::panicking::panic
             at /rustc/53cb7b09b00cbea8754ffb78e7e3cb521cb8af4b/library/core/src/panicking.rs:50:5
   3: <memflow::types::address::Address as core::ops::arith::Add<usize>>::add
             at ./rs/src/memflow/memflow/src/types/address.rs:288:16
   4: <memflow::mem::cache::cached_vat::CachedVirtualTranslate<V,Q> as memflow::mem::virt_translate::VirtualTranslate>::virt_to_phys_iter::{{closure}}::{{closure}}
             at ./rs/src/memflow/memflow/src/mem/cache/cached_vat.rs:172:47
   5: <memflow::iter::page_chunks::PageChunkIterator<T,FS> as core::iter::traits::iterator::Iterator>::next
             at ./rs/src/memflow/memflow/src/iter/page_chunks.rs:211:39
   6: core::iter::traits::iterator::Iterator::try_fold
             at /rustc/53cb7b09b00cbea8754ffb78e7e3cb521cb8af4b/library/core/src/iter/traits/iterator.rs:2005:29
   7: <core::iter::adapters::flatten::FlattenCompat<I,U> as core::iter::traits::iterator::Iterator>::try_fold::flatten::{{closure}}
             at /rustc/53cb7b09b00cbea8754ffb78e7e3cb521cb8af4b/library/core/src/iter/adapters/flatten.rs:305:25
   8: core::iter::adapters::map::map_try_fold::{{closure}}
             at /rustc/53cb7b09b00cbea8754ffb78e7e3cb521cb8af4b/library/core/src/iter/adapters/map.rs:89:21
   9: core::iter::adapters::filter_map::filter_map_try_fold::{{closure}}
             at /rustc/53cb7b09b00cbea8754ffb78e7e3cb521cb8af4b/library/core/src/iter/adapters/filter_map.rs:47:20
  10: core::iter::adapters::map::map_try_fold::{{closure}}
             at /rustc/53cb7b09b00cbea8754ffb78e7e3cb521cb8af4b/library/core/src/iter/adapters/map.rs:89:21
  11: core::iter::traits::iterator::Iterator::try_fold
             at /rustc/53cb7b09b00cbea8754ffb78e7e3cb521cb8af4b/library/core/src/iter/traits/iterator.rs:2006:21
  12: <core::iter::adapters::map::Map<I,F> as core::iter::traits::iterator::Iterator>::try_fold
             at /rustc/53cb7b09b00cbea8754ffb78e7e3cb521cb8af4b/library/core/src/iter/adapters/map.rs:115:9
  13: <core::iter::adapters::filter_map::FilterMap<I,F> as core::iter::traits::iterator::Iterator>::try_fold
             at /rustc/53cb7b09b00cbea8754ffb78e7e3cb521cb8af4b/library/core/src/iter/adapters/filter_map.rs:77:9
  14: <core::iter::adapters::map::Map<I,F> as core::iter::traits::iterator::Iterator>::try_fold
             at /rustc/53cb7b09b00cbea8754ffb78e7e3cb521cb8af4b/library/core/src/iter/adapters/map.rs:115:9
  15: <core::iter::adapters::fuse::Fuse<I> as core::iter::adapters::fuse::FuseImpl<I>>::try_fold
             at /rustc/53cb7b09b00cbea8754ffb78e7e3cb521cb8af4b/library/core/src/iter/adapters/fuse.rs:448:9
  16: <core::iter::adapters::fuse::Fuse<I> as core::iter::traits::iterator::Iterator>::try_fold
             at /rustc/53cb7b09b00cbea8754ffb78e7e3cb521cb8af4b/library/core/src/iter/adapters/fuse.rs:97:9
  17: <core::iter::adapters::flatten::FlattenCompat<I,U> as core::iter::traits::iterator::Iterator>::try_fold
             at /rustc/53cb7b09b00cbea8754ffb78e7e3cb521cb8af4b/library/core/src/iter/adapters/flatten.rs:316:16
  18: <core::iter::adapters::flatten::FlatMap<I,U,F> as core::iter::traits::iterator::Iterator>::try_fold
             at /rustc/53cb7b09b00cbea8754ffb78e7e3cb521cb8af4b/library/core/src/iter/adapters/flatten.rs:66:9
  19: core::iter::traits::iterator::Iterator::find_map
             at /rustc/53cb7b09b00cbea8754ffb78e7e3cb521cb8af4b/library/core/src/iter/traits/iterator.rs:2390:9
  20: <core::iter::adapters::filter_map::FilterMap<I,F> as core::iter::traits::iterator::Iterator>::next
             at /rustc/53cb7b09b00cbea8754ffb78e7e3cb521cb8af4b/library/core/src/iter/adapters/filter_map.rs:61:9
  21: core::iter::adapters::peekable::Peekable<I>::peek::{{closure}}
             at /rustc/53cb7b09b00cbea8754ffb78e7e3cb521cb8af4b/library/core/src/iter/adapters/peekable.rs:216:43
  22: core::option::Option<T>::get_or_insert_with
             at /rustc/53cb7b09b00cbea8754ffb78e7e3cb521cb8af4b/library/core/src/option.rs:933:26
  23: core::iter::adapters::peekable::Peekable<I>::peek
             at /rustc/53cb7b09b00cbea8754ffb78e7e3cb521cb8af4b/library/core/src/iter/adapters/peekable.rs:216:9
  24: <memflow::mem::cache::cached_vat::CachedVirtualTranslate<V,Q> as memflow::mem::virt_translate::VirtualTranslate>::virt_to_phys_iter
             at ./rs/src/memflow/memflow/src/mem/cache/cached_vat.rs:193:12
  25: <memflow::mem::virt_mem::virtual_dma::VirtualDMA<T,V,D> as memflow::mem::virt_mem::VirtualMemory>::virt_read_raw_list
             at ./rs/src/memflow/memflow/src/mem/virt_mem/virtual_dma.rs:167:9
  26: <P as memflow::mem::virt_mem::VirtualMemory>::virt_read_raw_list
             at ./rs/src/memflow/memflow/src/mem/virt_mem.rs:207:9
  27: memflow::mem::virt_mem::VirtualMemory::virt_read_raw_into
             at ./rs/src/memflow/memflow/src/mem/virt_mem.rs:68:9
  28: virt_read_raw_into
             at ./rs/src/memflow/memflow-ffi/src/mem/virt_mem.rs:73:5
  29: _ZN14CVirtualMemory18virt_read_raw_intoIJmPhmEEEiDpT_
             at ./rs/src/memflow/memflow-ffi/memflow_cpp.h:77:5