* process: add mypy types check to nox sessions

* Ignore type errors for not annotated modules

Several dependencies lack type annotations, or they don't advertise
themselves as type-annotated. We do not want `mypy` to complain about
these.

* Fix mypy complaints (batch 1)

* Fix mypy complaints (batch 2)

* Fix mypy complaints (batch 3)

* Fix mypy false positive errors

* Simplify external config options instantiation

* Do not ignore api-core in type checks

More recent releases of google-api-core have typing enabled.

* Remove unneeded __hash__ = None lines

* Use an alias for timeout type in client.py

* Fix PathLike subscription error in pre-Python 3.9

* Fix a typo in docstring

Co-authored-by: Tim Swast <swast@google.com>

* Add mypy to the list of nox sessions to run

* Fix opentelemetry type error

The Opentelemetry APi has changed from the minimum version the
BigQuery client currently uses, we thus need to bound the maximum
Opentelemetry version.

In addition, that maximum version does not yet support type checks, thus
it is ignored.

* 🦉 Updates from OwlBot

See https://github.com/googleapis/repo-automation-bots/blob/main/packages/owl-bot/README.md

* Exclude type-checking code from coverage

* Fix patching opentelemetry tracer pvoider

* Adjust get_job() return type, ignore opentelemetry

Co-authored-by: Tim Swast <swast@google.com>
Co-authored-by: Owl Bot <gcf-owl-bot[bot]@users.noreply.github.com>