Add getters to wallet info L1 data

[crisdut]

Description

This PR adds two new methods to access wallet info from layer 1, similar to those we have in layer 2. This simplifies the implementation of some modules, such as custom indexers and the asynchronous persistence layer.

In my case, where I was using IndexedDB (browser), adding these methods reduced my code by ~30% and made it more stable, as WASM's main problems are only detectable at runtime.

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 2 lines in your changes missing coverage. Please review.

Project coverage is 4.9%. Comparing base (139d936) to head (e3f00a2).

Files with missing lines	Patch %	Lines
src/wallet.rs	0.0%	2 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #75     +/-   ##
=======================================
- Coverage     4.9%   4.9%   -0.0%     
=======================================
  Files          24     24             
  Lines        2315   2317      +2     
=======================================
  Hits          113    113             
- Misses       2202   2204      +2     

Flag	Coverage Δ
rust	4.9% <0.0%> (-<0.1%)	⬇️

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