Bump version to 0.34.0 and finilized the CHANGELOG.md

[xgreenx]

Release v0.34.0

This release contains fixes for critical issues that we found before the audit. Mainly, these changes pertain to the Sparse Merkle Tree (SMT) and related code. The SMT API was extended to provide more flexibility and to allow users to select the most appropriate method their performance needs. Where possible, sequential SMT updates were replaced with constructors that take in a complete data set.

Added

• #476: The fuel_vm::Call supports From<[u8; Self::LEN]> and Into<[u8; Self::LEN]>.

• #484: The sparse::in_memory::MerkleTree got new methods from_set, root_from_set, and nodes_from_set methods. These methods allow a more optimal way to build and calculate the SMT when you know all leaves. The Contract::initial_state_root is much faster now (by ~15 times).

Removed

• #478: The CheckedMemRange is replaced by the MemoryRange.

Changed

• #477: The PanicReason::UnknownPanicReason is 0x00. The PanicReason now implements From<u8> instead of TryFrom<u8> and can't return an error anymore.

• #478: The memcopy method is updated and returns MemoryWriteOverlap instead of MemoryOverflow.

Fixed

• #482: This PR address a security issue where updates to a Sparse Merkle Tree could deliberately overwrite existing leaves by setting the leaf key to the hash of an existing leaf or node. This is done by removing the insertion of the leaf using the leaf key.

• #484: Fixed bug with not-working CreateMetadata.

Breaking

• #473: CFS and CFSI were not validating
  that the new $sp value isn't below $ssp, allowing write access to non-owned
  memory. This is now fixed, and attempting to set an incorrect $sp value panics.

• #485: This PR addresses a security
  issue where the user may manipulate the structure of the Sparse Merkle Tree.
  SMT expects hashed storage key wrapped into a MerkleTreeKey structure.
  The change is breaking because it changes the state_root generated by the SMT
  and may change the ContractId if the Create transaction has non-empty StoargeSlots.

All changes:

• Disallow setting $sp < $ssp using CFS and CFSI instructions by @Dentosal in Disallow setting $sp < $ssp using CFS and CFSI instructions #473
• MemoryRange rework by @Dentosal in MemoryRange rework #478
• Return the previous behavior of the data length GTF by @xgreenx in Return the previous behavior of the data length GTF #481
• chore: optimize smt common prefix count by @bvrooman in chore: optimize smt common prefix count #475
• refactor: SMT path iter uses leaf key by @bvrooman in refactor: SMT path iter uses leaf key #482
• Added a test to show a problem with leaf overriding by @xgreenx in Added a test to show a problem with leaf overriding #469
• Minor readibility improvements by @Dentosal in Minor readibility improvements #476
• feat: SMT update set by @bvrooman in feat: SMT update set #467
• Added more detailed descriptions to README files by @xgreenx in Added more detailed descriptions to README files #487
• Use a new sparse::MerkleTree::from_set function to calculate state root by @xgreenx in Use a new sparse::MerkleTree::from_set function to calculate state root #484
• Changed the API of the SparseMerkleTree to accept MerkleStorageKey by @xgreenx in Changed the API of the SparseMerkleTree to accept MerkleStorageKey #485
• PanicReason rework by @Dentosal in PanicReason rework #477