Rename compile method to compile_cmd

And add an empty implement of compile method.

Bug: 193668901
Test: m
Change-Id: I690be577a4ac79b00f2e151e5c9bf3d507feb83c
diff --git a/compos/src/compilation.rs b/compos/src/compilation.rs
index fec82a6..1499d4b 100644
--- a/compos/src/compilation.rs
+++ b/compos/src/compilation.rs
@@ -52,7 +52,7 @@
 
 /// Runs the compiler with given flags with file descriptors described in `fd_annotation` retrieved
 /// via `authfs_service`. Returns exit code of the compiler process.
-pub fn compile(
+pub fn compile_cmd(
     compiler_path: &Path,
     compiler_args: &[String],
     authfs_service: Strong<dyn IAuthFsService>,