Backport #345 and #407 #411
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…)" * feat: Add alternative snapshot design. This change adds a different snapshot design, that takes advantage of a newly defined trait named `DataSource`. DataSource is modeled after environmental data that would stay the same and most likely immutable for the entire duration of a CKB-VM program's lifecycle. An example could be the enclosing transaction (`ResolvedTransaction` in CKB's term) for CKB's smart contracts. No matter where and when we are running the smart contract, the enclosing transaction is always the same. By exploiting this property, we can reduce the size of a snapshot greatly: when a piece of data already exist in the DataSource, we won't need to store the same data in the snapshot. As long as we maintain enough information to locate them from the DataSource, the snapshot can successfully be used to resume the full running state of a CKB-VM Machine. * test: Ensure resumed VM has the same register and memory data * fix: Skip full memory comparison in chaos tests
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