TSDK-666 initWalletState parameter improvement

[DiademShoukralla]

Purpose

Ease of use improvement for using initWalletState. Now users do not have to do a (x=1,y=1) partial derivative of their Topl Main key pair before initializing a wallet state.

Approach

• Updated Signature of the function to take in a KeyPair (needed for partial derivation).
• Updated Service Kit to perform the partial derivation within the initWalletState function
• Updated all callers (tests) to use the updated parameter
• Updated documentation to use the updated parameter

Testing

• Ensure all tests pass
• Ensure all documentation examples run successfully. Note: The code examples within "Service Kit > Usage" are not directly runnable using scala-cli yet. This is because it depends on a released version of the SDK. These changes are not yet released but will be a part of beta2 (which is what the dependency references). In other words, this will be runnable once beta2 is released (which is when the documentation portal will be updated). Despite this, I ensured running the code in a worksheet works as expected (same as the other code examples).
• Used in brambl-cli and ensured the unit tests and integration tests all pass.

Tickets

• TSDK-666

[mundacho]

LGTM!