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: Ib0af82d4318854f265dc2ff31ee28795

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: Ib0af82d4318854f265dc2ff31ee28795b8bde74c

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