Add support to generate constraint settings/values for Soong config variables. This CL adds constraint settings/values for all Soong config variables parsed from Android.bp files in the tree, using generated values from soong_injection. Output of `b cquery //build/bazel/product_variables:all`: https://gist.github.com/jin/75d4f8f669dcd94d94230b8d7a6afc8a Output of `b cquery //system/apex:library_linking_strategy_sample_binary_unstripped --output=build`: https://gist.github.com/jin/b9c5fed4ca504911352aef0bed2bd136 Test: CI Bug: 198556411 Change-Id: Idfe71bb821374e6bfd4509d3d2e253d08102477e