Add profman tool: responsible to process profiles

This pulls out profile parsing from dex2oat into a separate tool.
Some additional refactoring:
- better return codes
- dex2oat now accepts only one profile file

This is the first step towards support secondary dex files and
extracting profiles out of the code_cache directory.

Bug: 26719109
Bug: 26563023
Change-Id: I364dad7e3beb22ef71c372739d5bcc490ae23270