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[pants_ng] An NG subsystem implementation (#23165)

Like OG subsystems, these are containers of options
read from flags, env vars and config files.

Unlike OG subsystems, these are not necessarily
singletons - you can have multiple instances of the
same subsystem active for different partitions of
sources that have different local config files.

Making OG subsystems non-singleton was not feasible,
for both design and performance reasons.

These NG subsystems are lighter weight and more 
streamlined than their OG counterparts:

- They support a more limited set of value types.
- Option registration is via a new `@option` decorator
  instead of the large menagerie of field type classes.

AI disclosure: Claude found a way to create a mypy plugin
  that prevents spurious empty body errors. I had to manually
  tweak the plugin to make it less verbose and more streamlined.

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