Python tools submodule + various stability fixes

• Python gotcha fixes
  • Fixed issues with mallocp segfaulting from Python
  • Fixed storage merge() segfaulting
• New Python tools submodule (timemory.tools)
  • tools.function_wrappers combines {start,stop}_{mpip,ompt,ncclp,mallocp}
    into one configurable handle and provides decorator + context-manager features
• New Python functions which are used within tools.function_wrappers
  • timemory.start_function_wrappers
  • timemory.stop_function_wrappers
• Fixed timemory-python-line-profiler script calling timemory.profiler
• API change in ring_buffer template
  • read/write member functions return pointer to object read/written to
    instead of bytes
• API change in storage and tsettings
  • Classes are declared as final to optimize any vtable calls
• Removed runtime_configurable restriction for do_enumerator_generate
  • This enables user_bundles to be used again in Python
• Added operation::python_class_name
• Updated examples:
  • ex_python_bindings (and libex_python_bindings)
• Fix to get_hash_identifier
• Removed concurrency comparison when generating a diff b/t two runs
• Fixed issues with popen.cpp guarding with TIMEMORY_WINDOWS but never defined