[python] On is-not-context error, show type

[johnkerl]

Issue and/or context: Found while working on #3581 / #3582.

In a debug script, due to a copy/paste error, I had

context = tiledbsoma.SOMATileDBContext(tiledb_config={
    "key1": "value1",
    "key2": "value2",
}),

Note the trailing comma, which I did not see. (In the copy-from text, this had been in an argument list where comma is needed. In the paste-to text, I was assigning it to a variable, where comma is not needed.)

Then, running a repro, I got

  File "/Users/kerl/git/single-cell-data/TileDB-SOMA/apis/python/src/tiledbsoma/options/_soma_tiledb_context.py", line 377, in _validate_soma_tiledb_context
    raise TypeError(f"context is not a SOMATileDBContext")
TypeError: context is not a SOMATileDBContext

This baffled me for a while since I was clearly setting context to be a tiledbsoma.SOMATileDBContext.

Only on debugging and inserting a print of type(context) did I see my error.

We need to automate that helpfulness here.

Changes:

Now it prints:

  File "/Users/kerl/git/single-cell-data/TileDB-SOMA/apis/python/src/tiledbsoma/options/_soma_tiledb_context.py", line 377, in _validate_soma_tiledb_context
    raise TypeError(f"context is not a SOMATileDBContext: got {type(context)}")
TypeError: context is not a SOMATileDBContext: got <class 'tuple'>

Notes for Reviewer:

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 1 line in your changes missing coverage. Please review.

Project coverage is 86.32%. Comparing base (77471b6) to head (148b954).
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3583      +/-   ##
==========================================
+ Coverage   86.27%   86.32%   +0.04%     
==========================================
  Files          55       55              
  Lines        6375     6375              
==========================================
+ Hits         5500     5503       +3     
+ Misses        875      872       -3     

Flag	Coverage Δ
python	86.32% <0.00%> (+0.04%)	⬆️

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Components	Coverage Δ
python_api	86.32% <0.00%> (+0.04%)	⬆️
libtiledbsoma	∅ <ø> (∅)