Add the bundle for P3 components and size-limit check

[web-padawan]

Fixes #176

Also added the size-limit to CI, in order to ensure that we match some (arbitrary) limit.
Current output looks like this:

  Package size: 192.33 KB
  Size limit:   200 KB

To run it locally, install the tool:

npm i -g size-limit

And then run it like this:

size-limit --why

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This change is 

[tomivirkki]

This is epic

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Reviewed 5 of 5 files at r1.
Review status: all files reviewed at latest revision, all discussions resolved.

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