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## Problem We want to expose the page service over gRPC, for use with the communicator. Requires #11995. Touches #11728. ## Summary of changes This patch wires up a gRPC server in the Pageserver, using Tonic. It does not yet implement the actual page service. * Adds `listen_grpc_addr` and `grpc_auth_type` config options (disabled by default). * Enables gRPC by default with `neon_local`. * Stub implementation of `page_api.PageService`, returning unimplemented errors. * gRPC reflection service for use with e.g. `grpcurl`. Subsequent PRs will implement the actual page service, including authentication and observability. Notably, TLS support is not yet implemented. Certificate reloading requires us to reimplement the entire Tonic gRPC server.