Add bazel profile related functions in paths.go

Bazel executions occurs in soong_ui and soong_cmd. To collection all
bazel metrics, several path functions are defined to return the path
to store a bazel profile gzipped file.

Bug: b/173028918
Test: m nothing
Change-Id: I78926c66f853233b3977aca22e8a3fcf28edda53