Add `x {check,build,doc} {compiler/library}` aliases.

While working on https://github.com/rust-lang/rust/pull/95503,
I realized that this will interfere with existing command lines:
Currently people run `x build library/std` expecting it to be added to the sysroot,
but after that change, it will *only* build `libstd` without making it available
for the toolchain.

It's debatable whether that's a breaking change that will be accepted; if so, this PR is absolutely
necessary to make sure there's a command for "build the standard library and add it to the sysroot".
Even if not, though, I think `x build library` is more clear about what actually happens than the
current `x build library/std`.

For consistency, also add support for `compiler` and all other command variants.  Note that `doc
compiler` was already supported, so in a sense this is just fixing an existing inconsistency.

I plan to change the dev-guide and various instructions in the README to `build library` once this is merged.

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