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Perf: lazy init the bootstrap scheduler (#23513)

Shaves of about 0.1s startup time. The second commit is
1. Preparatory work for when source plugins are imported in parallell,
regular sequential import leaves perf on the table
2. If the python backend is not used, in which case importing pex-rules
is wasted work. Not sure if those users exists, though.

I intend to introduce paralllel backend imports after
https://github.com/pantsbuild/pants/pull/23477.

I do not think this conflicts in spirit with
https://github.com/pantsbuild/pants/pull/21991. It does conflict in
direction with a comment here:
https://github.com/pantsbuild/pants/pull/11568, however I find
https://github.com/pantsbuild/pants/issues/10360 to have
resolved/obsoleted the motivation for the bootstrap scheduler there as
well.

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