test(sdk): aim to 100% coverage

[akanoce]

Aim to 100% coverage for every hook, provider or util exported by the sdk

The MVP should be unit tests with vitest + react-testing-library ensuring every hook behaves correctly in all possible scenarios.

• For read-only hooks, we can avoid mocking the requests to the nodes and ensuring the data returned matched a specific object structure and types;
• For write hooks, we could instead mock the methods to create and submit the tx, ensuring the state of the mutation hook updates corectly;