Populate apexBundle#filesInfo using bazel info.

This CL adds a few things:

1) Populate the filesInfo struct with cquery'd information from an
apex's ApexMkInfo provider. This filesInfo is then used in
apex/androidmk.go to generate Make modules (soong_cc_rust_prebuilt.mk),
which are then used in packaging to generate zip files of symbols in $PRODUCT_OUT.
2) Make a list of dicts of primitives JSON-encodable.
3) Tests.

Bug: 271423316
Bug: 271423062
Test: presubmits
Change-Id: Iaa34f51044de310510e580d9cf1fe60bbef801c1