Move CIPD package creation tools under tools/cipd (#24766)

This moves tooling related to the creation of the Android embedding
bundle CIPD package under tools/cipd. Having a single location for CIPD
package creation tooling avoids spreading these around the tree and aids
in discovery.

This does not change the path within the CIPD package repo, nor does it
change the path to which we download it via gclient as specified in the
DEPS file.

This will be followed by a patch to add a new Windows CIPD package
necessary for UWP builds.