[bazel][idk] Expose //sdk/history golden files to Bazel targets

In Bazel, files must be explicitly exported for use outside their
directory.

Also update the script that creates new API levels to add the necessary
BUILD.bazel file.

Bug: 490506836
Change-Id: I3abe391e1640f3ee56d0eeacbc174c9188963b87
Reviewed-on: https://fuchsia-review.googlesource.com/c/fuchsia/+/1531617
Commit-Queue: David Dorwin <ddorwin@google.com>
Reviewed-by: Jay Zhuang <jayzhuang@google.com>
Reviewed-by: Hunter Freyer <hjfreyer@google.com>