Remove submodules

Author: rschu1ze

.gitmodules

@@ -1,52 +0,0 @@
-[submodule "third_party/abseil-cpp"]
-	path = third_party/abseil-cpp
-	url = https://github.com/abseil/abseil-cpp.git
-[submodule "third_party/benchmark"]
-	path = third_party/benchmark
-	url = https://github.com/google/benchmark
-[submodule "third_party/bloaty"]
-	path = third_party/bloaty
-	url = https://github.com/google/bloaty.git
-[submodule "third_party/boringssl-with-bazel"]
-	path = third_party/boringssl-with-bazel
-	url = https://github.com/google/boringssl.git
-[submodule "third_party/cares/cares"]
-	path = third_party/cares/cares
-	url = https://github.com/c-ares/c-ares.git
-[submodule "third_party/envoy-api"]
-	path = third_party/envoy-api
-	url = https://github.com/envoyproxy/data-plane-api.git
-[submodule "third_party/googleapis"]
-	path = third_party/googleapis
-	url = https://github.com/googleapis/googleapis.git
-[submodule "third_party/googletest"]
-	path = third_party/googletest
-	url = https://github.com/google/googletest.git
-[submodule "third_party/opencensus-proto"]
-	path = third_party/opencensus-proto
-	url = https://github.com/census-instrumentation/opencensus-proto.git
-[submodule "third_party/opentelemetry"]
-	path = third_party/opentelemetry
-	url = https://github.com/open-telemetry/opentelemetry-proto.git
-[submodule "third_party/protobuf"]
-	path = third_party/protobuf
-	url = https://github.com/protocolbuffers/protobuf.git
-[submodule "third_party/protoc-gen-validate"]
-	path = third_party/protoc-gen-validate
-	url = https://github.com/envoyproxy/protoc-gen-validate.git
-[submodule "third_party/re2"]
-	path = third_party/re2
-	url = https://github.com/google/re2.git
-[submodule "third_party/xds"]
-	path = third_party/xds
-	url = https://github.com/cncf/xds.git
-[submodule "third_party/zlib"]
-	path = third_party/zlib
-	url = https://github.com/madler/zlib
-	# When using CMake to build, the zlib submodule ends up with a
-	# generated file that makes Git consider the submodule dirty. This
-	# state can be ignored for day-to-day development on gRPC.
-	ignore = dirty
-[submodule "third_party/opentelemetry-cpp"]
-	path = third_party/opentelemetry-cpp
-	url = https://github.com/open-telemetry/opentelemetry-cpp