Add android_info module type

This is heavily inspired by the implementation in
https://r.android.com/3081436. `android_info` will generate a .txt file
with board specific information which will subsequently be used to
generate build.prop file for vendor.

The key differences are
1. `android_info` is not a singleton module.
2. Create android_info.prop from android_info.txt. The .prop file will
   be passed to --prop-files when generating /vendor/build.prop
3. Board info properties like `TARGET_BOARD_INFO_FILES` will not be
   added to android.Config API. (But they will be added to the unstable
   `PartitionVarsForSoongMigrationOnlyDoNotUse` in a followup CL)
3. android-info.txt will _not_ be installed via ctx.InstallFile,
   atleast for now. This file is created in $PRODUCT_OUT, but not
   installed on device.

Test: m nothing --no-skip-soong-tests
Bug: 375500423
Change-Id: Ie79f4f5fe828d7876c12e224f4dff1cc17e1b4d4