Joe Tsai dd00a27837 reflect/prototype: simplify Format test %!s(int64=7) %!d(string=hai) anos
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protoreflect 812d9137df reflect/protoreflect: add Has and Clear to KnownFields and Map %!s(int64=7) %!d(string=hai) anos
protoregistry 23ddbd1430 reflect/prototype: add NewFileFromDescriptorProto constructor %!s(int64=7) %!d(string=hai) anos
prototype dd00a27837 reflect/prototype: simplify Format test %!s(int64=7) %!d(string=hai) anos