Improved Error Handling

[zombieobject]

Introduction 📟

Currently when errors from libXMTP are surfaced to consumers and integrators of the XMTP iOS SDK, they lack enough information about the specific nature of the error being thrown.

Purpose ℹ️

This pull request is intended to surfaces errors thrown via call sites from libXMTP that throw the error type FfiConverterTypeGenericError. This GenericErrorType always contains a string message that provides additional detail about the nature of the error being thrown.

This also address the following issue Improve Client Facing Errors

Scope 🔭

• ApiClient
• ApieClientError
• GenericErrorDescribing

Out of Scope ⚔️

• Error Localization
• Pretty User Facing Errors
• Additional error types that include a hybrid of error messages from both libXMTP and the XMTP iOS SDK. The included protocol and protocol Extension GenericErrorDescribing serves a reusable foundation for addressing these hybrid error types in future pull requests.
• SDK Version Increment & Release - This will occur in a subsequent pull request once coordination on any additional features to be included has completed.

Discussion 🎙

The protocol and subsequent protocol extension GenericErrorDescibing is included to enable extending error handling for errors thrown via additional call sites to libXMTP where the error type thrown is of FfiConverterTypeGenericError. Adopting the GenericErrorDescribing protocol will catch all instances of the enum and generate the string descriptions that are passed.