Merge pull request #10382 from ctiller/checks

BUILD

CMakeLists.txt

Makefile

binding.gyp

build.yaml

config.m4

gRPC-Core.podspec

grpc.gemspec

package.xml

src/core/lib/channel/http_client_filter.c

src/core/lib/channel/http_server_filter.c

src/core/lib/security/credentials/jwt/json_token.c

src/core/lib/security/credentials/jwt/jwt_verifier.c

src/core/lib/slice/b64.c

src/core/lib/slice/b64.h

src/cpp/common/channel_filter.h

src/python/grpcio/grpc_core_dependencies.py

test/core/security/BUILD

test/core/security/json_token_test.c

test/core/security/jwt_verifier_test.c