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This way we can more easily state lemmas for concrete languages for
arbitrary global functors.

This enables us to remove a whole bunch of type annotations.

Instead, we have just a construction to create a CMRA from a RA. This
construction is also slightly generalized, it now works for RAs over any
timeless COFE instead of just the discrete COFE.

Also:
* Put tactics and big_ops for CMRAs in a separate file.
* Valid is now a derived notion (as the limit of validN), so it does not have
  to be defined by hand for each CMRA.

Todo:
Make the constructions DRA -> CMRA and RA -> CMRA more uniform.

Since ssr ad273277 the Global Set Bullet Behavior in modures.base
should do the job.