The refactor separates out the parsing of care_map and the actual
verification of the partitions. Moreover, it skips the verification in case
of a format error in the care map.
Also, the parsing of care_map now uses the suffix of the file to
tell if it has the protobuf format or the plain text format.
Bug: 115740187
Test: unit test pass
Change-Id: I7aa32004db02af1deb7bfdc6f5bd7921eb7883e5
Switching to the protobuf format helps to make the care_map more
extensible. As we have such plans in the future, add the support to
parse the protobuf message in the update_verifier.
Bug: 77867897
Test: unit tests pass, update_verifier successfully verifies a care_map.pb
Change-Id: I9fe83cb4dd3cc8d6fd0260f2a47338fe142d3938
