[installd] Prepare profiles for app code paths

Implement profile preparation for individual application code paths.

The preparation is:
- create the current profile
- merge the profile from the dex metadata file (if present) into the
reference profile.

Note: currently the current profile is created as part of
InstalldNativeService::createAppData for the entire package. That logic
does not support dex metadata or individual code paths and will be removed
once the PackageManager switches over the new method.

Test: installd_dexopt_test
Bug: 30934496
Change-Id: I2aeddcda7b78017bd46838985bef5f92a79d4573