fix(wallet-lib): invalid deserialization of persistent storage

[markin-io]

Issue being fixed or feature implemented

The fix ensures proper data types casting for serialized items in the persistent storage at the moment of wallet initialization:

• Read data from persistent storage
• Deserialize to JSON objects
• Cast certain objects to correct data types (Transaction, BlockHeader, InstantLock, Output, UnspentOutput)

What was done?

Described storage types schema and wrote a function to validate storage against the schema and cast to correct types

How Has This Been Tested?

• Created relevant unit test
• Tested manually by starting wallet from persistent storage and broadcasting a transaction

Breaking Changes

Checklist:

• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have added or updated relevant unit/integration/functional/e2e tests
• I have made corresponding changes to the documentation

For repository code-owners and collaborators only

• I have assigned this pull request to a milestone

[jawid-h]

Looks legit to me.