bp2build for ndk_headers

Create bp2build converters for the following module types
- ndk_headers
- versioned_ndk_headers

Details
- Partial bp2build conversion. Only `cc_api_headers` targets will be
  generted within the scope of this CL
- Glob expansion. Aligned with other bp2build converters, this impl will
  expand globs in Android.bp so that all .h files are explicitly listed
  in the generated BUILD files. As an extreme example, the size of
  out/soong/workspace/bionic/libc/BUILD will increase from ~170KB to
  ~230KB (33% increase). This makes the BUILD files less readable, and
  `cc_api_headers` section of the BUILD file should probably not be
  checked into the tree in this format

Test: b cquery //bionic/libc:libc_uapi --output=starlark
--starlark:expr="providers(target).get('//build/bazel/rules/apis:cc_api_contribution.bzl%CcApiHeaderInfo')"
Test: go test ./bp2build
Test: go test ./cc

Change-Id: I810d5380f72dc90f4cdf4aa508570f3a80d8d932