Document scope_kwargs on capture_message

[untitaker]

The documentation steers for using sentry_sdk.set_tag instead of sentry_sdk.capture_message(..., tags={..}). This is a good default but we should be exhaustive in documenting options.

• sentry_sdk.set_tag
• configure_scope() can stay undocumented where global functions are available
• keyword arguments on capture_message
• push_scope should be better documented (outside Hubs/Scopes docs)

[github-actions]

This issue has gone three weeks without activity. In another week, I will close it.

But! If you comment or otherwise update it, I will reset the clock, and if you label it Status: Backlog or Status: In Progress, I will leave it alone ... forever!

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"A weed is but an unloved flower." ― Ella Wheeler Wilcox 🥀

[sentrivana]

Closing in favor of #2196