compliance package: listshare and checkshare

package to read, consume, and analyze license metadata and dependency
graph.

Includes the below command-line tools:

listshare outputs csv of projects to share to meet restricted and
reciprocal license requirements with one project per line. The first
field is the path to the project, and subsequent fields identify the
license resolutions as colon-separated target:annotations tuples.

checkshare outputs error messages to stderr for any targets where
policy dictates both sharing and not sharing the source-code, and PASS
or FAIL to stdout. exit status indicates success 0 or conflict found 1

Bug: 68860345
Bug: 151177513
Bug: 151953481

Test: m all
Test: m systemlicense
Test: m listshare; out/soong/host/linux-x86/bin/listshare ...
Test: m checkshare; out/soong/host/linux-x86/bin/checkshare ...
Test: m dumpgraph; out/soong/host/linux-x86/dumpgraph ...
Test: m dumpresolutions; out/soong/host/linux-x86/dumpresolutions ...

where ... is the path to the .meta_lic file for the system image. In my
case if

$ export PRODUCT=$(realpath $ANDROID_PRODUCT_OUT --relative-to=$PWD)

... can be expressed as:

${PRODUCT}/gen/META/lic_intermediates/${PRODUCT}/system.img.meta_lic

Change-Id: I4ff3f98848f7e6d03a35734300d763ef5f245d53