Updates gem dependencies, style rules

Correct storage classes of variables an functions

Removes nodejs pubsub example

Grpc ruby add interop cancellation tests

They don't need to be extern

Prevent symbol cache variables from being instantiated multipe times.

They do not need to be extern.

- Ensures that invalid status are raised as exceptions
- Ensures that exceptions during the write thread are bubbled up to the starting
  thread

Also - improves the debug messages during the BiDi calls

- uses Forwardable to provide access the @call within an ActiveCall
- removes redundant methods from ActiveCall

Inserts latency profiling timers at various interesting points.

Remove outdated protos

Batch unref metadata in HTTP/2 stream encoder

Removing some bashisms.

Need to go in and fill in tag later

Adding basic sanity test.

This was originally added for my sanity, but it proved unnecessary.

Grpc ruby enable jwt auth and and an interop test for it

Adding python to cloud prod tests.

Infrastructure for timer insertion, logging, and testing