Move xcode_configure to this repo

[keith]

This already references rules that live in this repo, so might as well
move the repository_rule here too. This makes it easier to make
additions to the rules as well

[keith]

this is paired with bazelbuild/bazel#29382

steps:

1. merge + create a release with this
2. this is immediately usable by folks who want to by either using --xcode_version_config=@@apple_support++xcode_configure_extension+local_config_xcode//:host_xcodes (probably not recommended) or by adding:

xcode_configure = use_extension("@apple_support//xcode:xcode_configure.bzl", "xcode_configure_extension")
use_repo(xcode_configure, "local_config_xcode")

to their MODULE.bazel and using --xcode_version_config=@local_config_xcode//:host_xcodes

3. update the bazel PR to point to the new release and merge it, cherry picking into 9.x should also be fine