soong_ui: Add --build-mode flag in soong_ui

The --build-mode flag is a new flag in soong_ui that accepts a build
action (m, mm, mmm, mma, mmma), the directory where the build action
is occuring and an optional list of build arguments and invokes the
build option. This is to deprecate the build actions behavior in
envsetup.sh and start using the one defined in soong_ui.

Bug: b/130049705
Test: Ran lunch and ran all the build action commands in soong_ui.
      Ran a bunch of invalid commands such as no Android.mk file in
      a specific directory, invalid target name, etc...

Change-Id: I88e9e59f47f8c5cdc872fb83a0f3f0a0919885b6