Set up build files for apksigner-kms

Create the various dependencies needed by `//tools/apksig` to support
signing apks via GCP.

Bug: 319296492
Test: TH

Change-Id: Id385980a9ee0fa39806e4125ad6d09e

Set up build files for apksigner-kms

Create the various dependencies needed by `//tools/apksig` to support
signing apks via GCP.

Bug: 319296492
Test: TH

Change-Id: Id385980a9ee0fa39806e4125ad6d09e645e6ec94

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