Add a converter to/from Double2DArray.

[mjohanse-emr]

What does this Pull Request accomplish?

Allows panel clients to read/write 2D collections of floats using set_value() and get_value(). The most common expected use case is a list of list of floats, but this change supports tuples, sets, and frozen sets as well.

This change includes:

• A new converter from Collection[Collection[float]] to/from Double2DArray
• A refactor to _get_best_matching_type() to allow for detecting nested python collections.
• Unit tests at each level
• Additional unit tests for the Enum types to make sure I didn't break those.

Why should this Pull Request be merged?

Satisfies the requirements AB#3166107 (at least for now**)

** Caveat: There are discussions going on about what protobuf type to use for 2D collections. I used Double2DArray for this change as a means to prove out that we can detect nested collections in _convert.py. The actual implementation of the converter may change if we decide to use a different protobuf type to pass these 2D collections over the wire.

What testing has been done?

Unit tests, mypy, ni-python-styleguide.

[github-actions]

Test Results

   10 files  ±  0     10 suites  ±0   19s ⏱️ -3s
  189 tests + 39    189 ✅ + 39  0 💤 ±0  0 ❌ ±0 
1 840 runs  +370  1 840 ✅ +370  0 💤 ±0  0 ❌ ±0 

Results for commit f06cdb9. ± Comparison against base commit dcaf336.

This pull request removes 5 and adds 44 tests. Note that renamed tests count towards both.

tests.unit.test_convert ‑ test___various_python_objects___get_best_matching_type___returns_correct_type_string[python_object5-Collection.bool]
tests.unit.test_convert ‑ test___various_python_objects___get_best_matching_type___returns_correct_type_string[python_object6-Collection.bytes]
tests.unit.test_convert ‑ test___various_python_objects___get_best_matching_type___returns_correct_type_string[python_object7-Collection.float]
tests.unit.test_convert ‑ test___various_python_objects___get_best_matching_type___returns_correct_type_string[python_object8-Collection.int]
tests.unit.test_convert ‑ test___various_python_objects___get_best_matching_type___returns_correct_type_string[python_object9-Collection.str]

tests.unit.test_convert ‑ test___double2darray___from_any___valid_python_2dcollection
tests.unit.test_convert ‑ test___python_2dcollection_of_float___to_any___valid_double2darray[python_value0]
tests.unit.test_convert ‑ test___python_2dcollection_of_float___to_any___valid_double2darray[python_value1]
tests.unit.test_convert ‑ test___python_2dcollection_of_float___to_any___valid_double2darray[python_value2]
tests.unit.test_convert ‑ test___python_2dcollection_of_float___to_any___valid_double2darray[python_value3]
tests.unit.test_convert ‑ test___python_2dcollection_of_float___to_any___valid_double2darray[python_value4]
tests.unit.test_convert ‑ test___python_2dcollection_of_float___to_any___valid_double2darray[python_value5]
tests.unit.test_convert ‑ test___python_2dcollection_of_float___to_any___valid_double2darray[python_value6]
tests.unit.test_convert ‑ test___python_2dcollection_of_float___to_any___valid_double2darray[python_value7]
tests.unit.test_convert ‑ test___python_set_of_collection_of_float___to_any___valid_double2darray[python_value0]
…

♻️ This comment has been updated with latest results.

[mikeprosserni]

Can you add the new 2D types to the new all_types example? You can just add them to all_types_with_values in examples\all_types\define_types.py.