* remove all Pubkey::default();
1. the value does not make sense
2. we can safely assume that bytes can be deserialized
* use Signature instead of String
* use solana_sdk:#️⃣:Hash for blockhash
* store VersionedMessage instead of serialized bas64 string
* refactor compute_budget extraction
* fix test data
* simplify map_compute_budget_instructions
* fmt
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Co-authored-by: godmodegalactus <godmodegalactus@gmail.com>