Add name component to SeriesLine & SeriesPoints

[Wumpf]

What

• Needed by Update all examples that use TimeSeriesScalar to use Scalar instead #5042

Last commit also removes the now fairly useless Text component on Scalar (until we support labeling points).
This makes it a bit less compatible with the legacy TimeSeriesScalar, but that in and on itself shouldn't be much of a problem.

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 the web demo (if applicable):
  • Using newly built examples: app.rerun.io
  • Using examples from latest main build: app.rerun.io
  • Using full set of examples from nightly build: app.rerun.io
• The PR title and labels are set such as to maximize their usefulness for the next release's CHANGELOG

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