[libc++] Remove allocator support from std::function (#140395)

The allocator support was removed in P0302R1, since it was impossible to
implement. We're currently providing the API for this, but ignore the
allocator in all cases but one (which is almost certainly an oversight).
That case is the `function(allocator_arg_t, const Alloc&, Func)`
constuctor. IMO we should remove the API entirely at a later date, but
this only removes most of the code for now, leaving only the public
functions. This not only simplifies the code quite a bit, but also
results in the constructor being instantiated ~8x faster.

Fixes #133901

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