Create .kzip files for kotlin translation units

This CL creates the build rules to invoke the standalone kotlin
extractor and create .kzip files for each kotlin translation unit. These
will be indexed by the internal g3 kotlin indexers

Implementation details
- Create a `kotlinKytheExtract` static rule. Its inputs will be source
  .kt/.srcjar files and other verbatim args passed to kotlinc. The
extrator will serialize this information into a .kzip file. The .kzip
file should contain the necessary information to "replay" the
compilation
- Create a xref_kotlin phony rule to build all .kzip files corresponding
  to kotlin translation units.

This implementation has one limitation. Since the kotlin indexers
"replay" the compilation using its own version of kotlinc-jvm, there
might be indexing issues caused by kotlinc version skew between android
builds and indexing builds. `-kotlin-home` can likely solve that, but
this CL defers that for now.

Bug: 265428637
Test: Built the phony `xref_kotlin`, and ran the indexer locally using go/kythe-git-local-run#indexing-to-local-xrefs-server

Change-Id: Ifb370f2df8aa46f71df3fe1ae7d7aa5da773cc8b