Add typos to Invidious

[syeopite]

Serious title: Add job to check spelling via typos tool as apart of CI

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I recently learned that ameba has integrations with the typos tool to detect spelling mistakes within the source code, though it does need to be installed first but I'm not exactly sure how to do that so it'll be done in a separate job for now.

The next release of the Ameba Github Actions program (which should include the typos tool) should add support to create annotations without needing a token so we can just merge both the Ameba and spell check jobs into one once we switch to the action program.

[unixfox]

(Now copilot can scan for typos ^^) https://github.com/iv-org/invidious-companion/pull/107#discussion_r2319349386

[syeopite]

Maybe CHANGELOG.md should also be excluded?