Create objects for delegating components

[jleibs]

What

Builds on top of: #3302

One of the items raised by #3268 was wanting to extend a component type. But components previously had no instantiation.

This PR creates Component objects that derive from their baseclass as well as the extension class. These can be used anywhere the datatype could be used instead.

Example with TextLogLevel:

>>> rr2.TextLog(body="Hello", level=rr2.cmp.TextLogLevel.WARN)
rr.TextLog(
  rerun.label<string>(
    ['Hello']
  )
  rerun.components.TextLogLevel<string>(
    ['WARN']
  )
  rerun.colorrgba<uint32>(
    []
  )
)

>>> rr2.TextLog(body="World", level=rr2.cmp.TextLogLevel("my custom level"))
rr.TextLog(
  rerun.label<string>(
    ['World']
  )
  rerun.components.TextLogLevel<string>(
    ['my custom level']
  )
  rerun.colorrgba<uint32>(
    []
  )
)

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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[jleibs]

https://github.com/rerun-io/rerun/pull/3303/files?w=1

[emilk]

:D