Support aapt2 resources flagging

This change modifies the aconfig and aapt2 build rules to support
resources flagging in aapt2.

Implementation details:
- Modify the aconfig text rule to include flag permission in the output
  text file
- Pass the `--flags-packages` argument to `aapt2 compile` command,
  similar to what is currently being done in the `aapt2 link` command

Bug: 344979955
Test: m nothing --no-skip-soong-tests
Change-Id: I3b0b1fd6dcd691b7cc50ba3d081ecafd82c2c904