This change makes android.hardware.configstore-utils library built as
a header-only library instead of a static library.
Design doc: go/design-confighal
Bug: 35397068
Test: build, run
Change-Id: Idee48816a1a271bdb9ba8cf907d98c3823925da4
this change adds a set of library functions to facilitate
accessing(retrieving) configuration items.
Specifically, added template functions for accessing configuration
items for following types:
OptionalBool, OptionalInt32, OptionalUInt32, OptionalInt64,
OptionalUInt64, OptionalString
Design doc: go/design-confighal
Bug: 34724435
Test: build, run
Change-Id: Icca56d0d9e086b9d94c9b1168df041bf7d418698