Add tests for string APIs for implicit presence fields. By "string APIs", I mean the following APIs: - mutable_foo - set_allocated_foo - release_foo See also: https://protobuf.dev/reference/cpp/cpp-generated/#implicit-string Add the following test cases (for singular implicit-presence fields): - A single call to mutable_foo() should not result in additional serialization on the wire. - Assigning an empty string to mutable_foo() should not result in additional serialization on the wire. - Calling set_allocated_foo() with an empty string should not result in additional serialization on the wire. - If a field is nonempty, release_foo() effectively clears the field (while returning a pointer to the original data). Adding coverage for these behaviours can increase confidence when we introduce internal hasbits to help with presence tracking for implicit presence fields. mutable_foo will in general set the hasbit, so the generated code will need to check that field is nonempty before serializing. PiperOrigin-RevId: 658562530
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