sourcedr: Add 2 commands to check source file deps

This commit adds list_installed_module_under_source.py, which checks
the installed modules that relies on the source under the specified
directory.

This commit adds list_source_file.py, which lists all input source files
that are necessary to build an installed module.

Test: Run this tool on aosp_walleye-userdebug and search for the
dependency of libneuralnetworks.so

Change-Id: I7f0d82e30f994a942e3e43b0f554ec62cf7baff1