Add bp2build support for property "compressible" of apex module.

Bug: 214466457
Bug: 207551677
Test: b build //build/bazel/examples/apex/minimal:build.bazel.examples.apex.minimal
Test: b test //build/bazel/tests/apex:build.bazel.examples.apex.minimal_apex
Test: b test //build/bazel/tests/apex:build.bazel.examples.apex.minimal_capex

Change-Id: I6bf12c1b0c52d4486968bb430a67a3c3110766db