Introduce build_from_text_stubs property in java_sdk_library

Note that this property is currently a no-op. This change is submitted
separately in order to prevent submitting the entire topic in git_main
to mark a main-only module with this property.

Test: m nothing
Bug: 327507877
Change-Id: I62c2e3522bf9d0c5f7955e7c9bd2e0f66458e48c

java/sdk_library.go

@@ -661,6 +661,10 @@ type sdkLibraryProperties struct {
 	// depend on.
 	Aconfig_declarations []string
 
+	// Determines if the module generates the stubs from the api signature files
+	// instead of the source Java files. Defaults to true.
+	Build_from_text_stub *bool
+
 	// TODO: determines whether to create HTML doc or not
 	// Html_doc *bool
 }