Fix various doc links in SDKs

[Wumpf]

PR title is an accompanying changelog entry, but the real thing here is all about codegen fixes:

• use reporter for doc issues
• make reporter output colored
• support field & enum links - this is a bit limited depending on the language. Experimented a bit, but deemed this now good enough. We don't use those often anyways
• fix links
• disable warnings for python autogen serialization being available when a custom one is present - in all cases we have the custom serialization there for a good reason or aren't entirely sure if it would break something

[github-actions]

Latest documentation preview deployed successfully.

Result	Commit	Link
✅	139c7db	https://landing-c217e3gxf-rerun.vercel.app/docs

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[github-actions]

Web viewer built successfully. If applicable, you should also test it:

• I have tested the web viewer

Result	Commit	Link
✅	139c7db	https://rerun.io/viewer/pr/8331

^{Note: This comment is updated whenever you push a commit.}

[Wumpf]

drafted: some links are wrong, need to fix this up

[emilk]

Awesome, thank you!

Can we fix the contents of docstring_md while we're at it? 🙏