Enable gradual migration to protobuf v2 APIs #125
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First commit backports the v2 linter engine from https://github.com/googleapis/api-linter - intentionally no changes made.
Second commit incorporates the v2 linter engine to run alongside the existing v1 engine. Enabling gradual migration of linter rules from v1 to v2 in subsequent changes.
Trade-off of this approach (running v1 and v2 simultaneously) is increased processing cost from parsing all files twice (jhump/protoreflect and bufbuild/protocompile). Benefit is we can make minimal changes to the existing battle-tested v1 and v2 code during the migration.