Put workaround list somewhere accessable by wrapping languages

CMakeLists.txt

Makefile

build.yaml

gRPC-Core.podspec

grpc.gemspec

include/grpc/support/workaround_list.h

package.xml

src/core/ext/filters/workarounds/workaround_utils.h

test/core/surface/public_headers_must_be_c89.c

third_party/protobuf

tools/doxygen/Doxyfile.core

tools/doxygen/Doxyfile.core.internal

tools/run_tests/generated/sources_and_headers.json

vsprojects/vcxproj/gpr/gpr.vcxproj

vsprojects/vcxproj/gpr/gpr.vcxproj.filters