Remove duplicate session_pb2 codegen, add ni-apis submodule and dependency on ni.grpcdevice.v1.proto

[rahur-NI]

• This contribution adheres to CONTRIBUTING.md.
• I've updated CHANGELOG.md if applicable.
• I've added tests applicable for this pull request

What does this Pull Request accomplish?

Replaces the duplicate session_pb2 protobuf codegen in each nimi-python driver modules with a dependency on ni.grpcdevice.v1.proto (similar to [ni/nidaqmx-python#859].

• Replaced relative import from . import session_pb2 with absolute import session_pb2 in _grpc_stub_interpreter.py.mako
• Install ni.grpcdevice.v1.proto>=1.0.0 as part of installers for modules that support grpc.
• Updated mak files to remeve generation of session_pb2.py and session_pb2_grpc.py
• Added third_party/ni-apis as a git submodule pointing to [https://github.com/ni/ni-apis]
• Deleted session.proto file
• Added submodules: true to all GitHub Actions checkout steps so CI clones the submodule

List issues fixed by this Pull Request below, if any.

• Fix session.proto should be replaced with a dependency on ni.grpcdevice.v1.proto #2146

What testing has been done?

• A successful tox.
• Codegen files have no changes other than importing from installed ni.grpcdevice.v1.proto package than importing from locally generated session_pb2 file as before.

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 89.85%. Comparing base (304563a) to head (6a40e64).

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #2176   +/-   ##
=======================================
  Coverage   89.85%   89.85%           
=======================================
  Files          73       73           
  Lines       19006    19006           
=======================================
+ Hits        17077    17078    +1     
+ Misses       1929     1928    -1     

Flag	Coverage Δ
codegenunittests	84.90% <ø> (ø)
nidcpowersystemtests	94.65% <100.00%> (+0.04%)	⬆️
nidcpowerunittests	89.53% <ø> (ø)
nidigitalsystemtests	92.26% <100.00%> (ø)
nidigitalunittests	68.44% <ø> (ø)
nidmmsystemtests	92.72% <100.00%> (ø)
nifakeunittests	86.01% <100.00%> (ø)
nifgensystemtests	94.61% <100.00%> (ø)
nimodinstsystemtests	73.85% <ø> (ø)
nimodinstunittests	94.20% <ø> (ø)
nirfsgsystemtests	81.12% <100.00%> (ø)
niscopesystemtests	92.94% <100.00%> (ø)
niscopeunittests	43.20% <ø> (ø)
nisesystemtests	91.50% <ø> (ø)
niswitchsystemtests	82.03% <100.00%> (ø)
nitclksystemtests	94.87% <ø> (ø)
nitclkunittests	98.26% <ø> (ø)

Flags with carried forward coverage won't be shown. Click here to find out more.

Files with missing lines	Coverage Δ
...ated/nidcpower/nidcpower/_grpc_stub_interpreter.py	89.40% <100.00%> (ø)
...ated/nidigital/nidigital/_grpc_stub_interpreter.py	89.60% <100.00%> (ø)
generated/nidmm/nidmm/_grpc_stub_interpreter.py	87.91% <100.00%> (ø)
generated/nifake/nifake/_grpc_stub_interpreter.py	85.11% <100.00%> (ø)
generated/nifgen/nifgen/_grpc_stub_interpreter.py	88.03% <100.00%> (ø)
generated/nirfsg/nirfsg/_grpc_stub_interpreter.py	78.32% <100.00%> (ø)
...enerated/niscope/niscope/_grpc_stub_interpreter.py	85.57% <100.00%> (ø)
...erated/niswitch/niswitch/_grpc_stub_interpreter.py	81.45% <100.00%> (ø)

... and 1 file with indirect coverage changes

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