Merge pull request #7862 from makdharma/grpc_caching

include/grpc/impl/codegen/grpc_types.h

src/core/lib/channel/http_client_filter.c

src/core/lib/channel/http_client_filter.h

src/core/lib/channel/http_server_filter.c

src/core/lib/surface/server.c

src/core/lib/transport/static_metadata.c

src/core/lib/transport/static_metadata.h

src/core/lib/transport/transport.h

test/core/end2end/fuzzers/hpack.dictionary

tools/codegen/core/gen_static_metadata.py