Add the remaining space views and name them consistently

[jleibs]

What

Just lots of boiler plate with some name changes.

Also split the apy.py file into a few sub-modules because it was getting large.

All SpaceViews now end in View.

• Spatial2DView
• Spatial3DView
• BarChartView
• TensorView
• TextDocumentView
• TextLogView
• TimeSeriesView

Testing it out on the plots example:

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
• If applicable, add a new check to the release checklist!

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