Introduce run_full_performance.sh and support 32core scenarios

Simplify profiling in C# qps clients.

C# assorted cleanup

Fix code coverage.

Add very much needed documentation for tools/run_tests/ directory

Assert we get a valid creds.

Make qps workers connect before even warmup stage begins

Correct assertion for single FD being orphaned.

Manual merge of 0.14 branch into master.

PHP: update package.xml after fixes

Handle signals properly when dropping GVL

Misc changes to stress test framework (to reduce false positives and tools for debugging)

Fix some fuzzing bugs, expand corpora

Add compression support to lower Python/Cython layers

Tiny fix to check_include_guards script

Add an explicit base class pointer to avoid potential breakage.

Fixed compression interop and re-enable for C++.

grpc-accept-encoding checks

Updated functions with TSRM macros for ZTS support

Updated functions with TSRM macros for ZTS support