Convert all of the callers of ModuleProvider/ModuleHasProvider to use the
type-safe android.SingletonModuleProvider API.
Bug: 316410648
Test: builds
Change-Id: I6f11638546b64749e451cebbf33140248dc1d193
Alongside with the generated proto file, the aconfig_declaration now
also outputs a text file that lists aconfig flags and values of its
corresponding proto file, in the format as shown below:
```
my.flag1=true
my.flag2=false
...
```
To prevent confusion between the preexisting proto file and the newly
introduced text file, the change also renames the variables of the proto
file from `intermediatePath` to `intermediateCacheOutputPath` and
likewise.
The utilization of the generated text file will be done in the child
changes.
Test: m out/soong/.intermediates/build/make/tools/aconfig/aconfig.test.flags/intermediate.txt && inspect output
Bug: 306024510
Change-Id: Iee16ad57bb87e992a477fc96502f79e971d01233
Bug: 283910439
Test: m dist ; m all_aconfig_declarations ; gqui from all_aconfig_declarations.pb proto /source/aosp-master-with-phones/build/make/tools/aconfig/protos/aconfig.proto:android.aconfig.parsed_flags
Change-Id: Ia89c7f9c53fa1600fa2f9c8ea01319e949e09f58