chore: fix typos across codebase

[sukrucildirr]

Fixed typos across codebase.

[macroscopeapp]

Fix typos in comments and documentation across multiple modules in the XMTP codebase

Corrects spelling errors in comments, documentation, and error messages across 11 files in the XMTP codebase. The changes include fixing common misspellings such as 'unintentially' to 'unintentionally', 'compatability' to 'compatibility', 'procesed' to 'processed', and 'siganture' to 'signature' in modules including xmtp_api_d14n/src/endpoints/d14n/get_newest_envelopes.rs, xmtp_mls/src/groups/mls_sync.rs, xmtp_cryptography/src/basic_credential.rs, and other core components.

📍Where to Start

Start with any of the modified files as they contain independent typo corrections, but xmtp_mls/src/groups/mls_sync.rs contains the most corrections and would provide a good overview of the types of changes made.

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Macroscope summarized e6aa219.