Define resultset.

Added grpc_byte_buffer_reader_readall

Coverage improvements

Move static value grpc::string_ref::npos definition to cc file

Fixing proto dependencies for targets that aren't libraries.

Mirrors a node test, and fix a bug that it found

Mark a method with GRPC_OVERRIDE to avoid compiler warning

Needed to properly implement pollset reset

Create a separate utility for reporting.

Add simple profiling instrumentation for C#

If we already have a status from the wire when we're disconnecting,
leave it in place - don't overwrite it. Fixes disappearing_server_test.

Fix nap condition for pollset wakeup

If:
- one thread issues a kick forcing pollset re-evaluation
- concurrently with a second thread forcing a specific poller to be awoken
And:
- both threads kicks are processed as a single wakeup
Then:
- since we enqueue nothing to the exec_ctx in this situation, we responded to the wakeup by doing another poll until the timeout, ignoring urgent work up the stack

Fix this by flagging that a specific worker was designated to be awoken (since this is a good signal that we really really need to wake up), and use that to still re-evaluate the poll set, but with an immediate deadline so that we fall out of the poll loop as soon as possible.

Fixed potential stack corruption