Remove ext= and allow logging extra component bundles

[jleibs]

What

• Builds on top of Introduce AnyValues as an alternative to extension_components #3561

With AnyValues as a means of quickly creating arbitrary component bundles, it's nice to be able to log these on a single line.

I briefly looked into adding + to components, but making it guaranteed to play nicely with arbitrary user extension components introduced more risk than I think it gained in clarity.

This simply allows log to consume any additional unnamed args as extra sets of components which are merged into the logging set.

This replaces:

rr.log(
    "extra_values",
    rr.Points2D([[-1, -1], [-1, 1], [1, -1], [1, 1]]),
    ext={'confidence': [0.3, 0.4, 0.5, 0.6]}
)

With

rr.log(
    "extra_values",
    rr.Points2D([[-1, -1], [-1, 1], [1, -1], [1, 1]]),
    rr.AnyValues(
        confidence=[0.3, 0.4, 0.5, 0.6],
    ),
)

A bit more typing involved, but gets rid of special handling of an ext keyword in a way that paves a much clearer path to users adding their own custom components.

Checklist

• I have read and agree to Contributor Guide and the Code of Conduct
• I've included a screenshot or gif (if applicable)
• I have tested demo.rerun.io (if applicable)

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[abey79]

👍🏻