service: Add generic create_session(s) API

[bkeryan]

• This contribution adheres to CONTRIBUTING.md.

What does this Pull Request accomplish?

Add the generic create_session(s) API and some of the infrastructure needed for the driver-specific APIs.

session_management:

• Add TSession and TSession_co type variables
• Add session: object = None to SessionInformation to allow returning a session object along with the session info
• Add a TypedSessionInformation[TSession_co] protocol to allow returning session objects in a type-safe manner
  • Python versions <3.11 don't support generic named tuples, so I think a protocol is the best we can do.
  • The protocol doesn't exactly match the SessionInformation class because TSession_co is narrower than object, so a cast is needed.
• Add the generic create_session and create_sessions methods.
  • The core implementation is split out to hide the use of @contextlib.contextmanager from documentation and hover help

_drivers:

• New subpackage for driver-related code
• Provides a closing_session function to use to create a context manager to close the session

_drivers._grpcdevice:

• Provides a get_insecure_grpc_device_channel function

Why should this Pull Request be merged?

Part of the new session management API.

What testing has been done?

Ran mypy and tests.

[github-actions]

Test Results

     12 files  ±    0       12 suites  ±0   3m 38s ⏱️ + 1m 5s
   304 tests +  22     238 ✔️ +  22    66 💤 ±0  0 ❌ ±0 
3 636 runs  +264  2 828 ✔️ +264  808 💤 ±0  0 ❌ ±0 

Results for commit f3719a6. ± Comparison against base commit 032ad4d.

♻️ This comment has been updated with latest results.

[dixonjoel]

Approved with a few queries and relatively minor points. Since I'm out early this week, I don't want to hold anything up so feel free to bypass me. Maybe @pbirkhol-ni should take a quick look before submitting.

[pbirkhol-ni]

Looks good to me. I didn't see any functional discrepancies between LabVIEW and python, although the implementation itself is radically different. :)