Add microbenchmark of single-threaded CQ operations

Contain the links for the pending handshake managers inside handshake…

Fix typo

Remove internal api canaries: they have never solved anything for us

Add counters for rmw atomic operations to microbenchmarks

Fix class name on documentation

Remove dead code

Temporarily disable lb policies test

C++ default health checking service.

Speed up latency profiling (and tune down the memory usage)

C++ Bazel files

Initial test/cpp/util/BUILD file.

PHP: add macro for arg info in extension