Add latency profiling from 'important' marks

Allows seeing directly how long was spent:
- running up to putting bytes on the wire
- between sending and receiving
- between receiving and finishing

Fix of Issue #7181 documentation and Objective C code

Fix arguments for calls to Ruby's `Time.at`

C style guide updates

Generate html report for perf tests

Add clientSuccess and serverSuccess to BQ schema

Add ruby client compression interop tests

PHP: unify the version of google/auth

regenerate projects

Benchmark fixes

Delay beginning most writes until we enter poll()

Add more assertions to _rpc_test

Make Server::Wait work for async only server.

Add csharp check to return val of byte_buffer_reader_init

Set more build-flags in `setup.py`s

Skip exit_test until flake is fixed

PHP: fix interop tests breakage

Add a quick note on the write chain execution\nthis is changed already in a future commit, so this should be enough for now

php: prepare for GA release