Add vendor snapshot modules

This implements four modules (static/shared/header libraries, and
binaries) for vendor snapshot. These modules will override source
modules if BOARD_VNDK_VERSION != current.

Bug: 65377115
Test: 1) VNDK_SNAPSHOT_BUILD_ARTIFACTS=true m dist vndk vendor-snapshot
Test: 2) install snapshot under source tree
Test: 3) set BOARD_VNDK_VERSION and boot cuttlefish
Change-Id: I24ddb4c3aa6abeab60bbfd31bcbd8753e2592dc5

android/module.go

@@ -204,6 +204,7 @@ type Module interface {
 	DepsMutator(BottomUpMutatorContext)
 
 	base() *ModuleBase
+	Disable()
 	Enabled() bool
 	Target() Target
 	InstallInData() bool
@@ -839,6 +840,10 @@ func (m *ModuleBase) Enabled() bool {
 	return *m.commonProperties.Enabled
 }
 
+func (m *ModuleBase) Disable() {
+	m.commonProperties.Enabled = proptools.BoolPtr(false)
+}
+
 func (m *ModuleBase) SkipInstall() {
 	m.commonProperties.SkipInstall = true
 }