Modify Soong to utilize from-text android.jar in build

Context
- from-text android.jar files are built using Metalava, and these can be
  utilized in `decodeSdkDep` so that any modules that depends on APIs
  can be compiled using from-text android.jars
- This change removes dependency on source java files when compiling
  stub android.jar files

Implementation
- Modify java_api_library module to create system modules using the
  generated android.jar
- Replace modules in decodeSdkDep to link against java_api_library
  modules
- Add --build-from-text-stub flag to hide the feature behind a flag

Test: m --build-from-text-stub
Bug: 271154441
Change-Id: I104df595edc65c0006820d5ae5b15f1fb167e190
diff --git a/ui/build/config.go b/ui/build/config.go
index 20cc9fb..7c226dd 100644
--- a/ui/build/config.go
+++ b/ui/build/config.go
@@ -88,6 +88,7 @@
 	searchApiDir      bool // Scan the Android.bp files generated in out/api_surfaces
 	skipMetricsUpload bool
 	buildStartedTime  int64 // For metrics-upload-only - manually specify a build-started time
+	buildFromTextStub bool
 
 	// From the product config
 	katiArgs        []string
@@ -509,6 +510,11 @@
 		}
 	}
 
+	if ret.BuildFromTextStub() {
+		// TODO(b/271443071): support hidden api check for from-text stub build
+		ret.environ.Set("UNSAFE_DISABLE_HIDDENAPI_FLAGS", "true")
+	}
+
 	bpd := ret.BazelMetricsDir()
 	if err := os.RemoveAll(bpd); err != nil {
 		ctx.Fatalf("Unable to remove bazel profile directory %q: %v", bpd, err)
@@ -833,6 +839,8 @@
 			} else {
 				ctx.Fatalf("unknown option for ninja_weight_source: %s", source)
 			}
+		} else if arg == "--build-from-text-stub" {
+			c.buildFromTextStub = true
 		} else if strings.HasPrefix(arg, "--build-command=") {
 			buildCmd := strings.TrimPrefix(arg, "--build-command=")
 			// remove quotations
@@ -1155,6 +1163,10 @@
 	return c.skipConfig
 }
 
+func (c *configImpl) BuildFromTextStub() bool {
+	return c.buildFromTextStub
+}
+
 func (c *configImpl) TargetProduct() string {
 	if v, ok := c.environ.Get("TARGET_PRODUCT"); ok {
 		return v