Annotate Widget params as Any

[gandhis1]

Part of #7078

Users who run their own code in Mypy strict mode require that all calls they make are to typed interfaces.

I did initially explore the possibility of annotating these **params as Unpack[TypedDict] (see PEP 692) but it was not readily apparent from the source code what all the possibilities were, and until PEP 728 is accepted this had the potential to break perfectly valid code that were using parameters that I did not anticipate. So I dropped this idea pretty quickly.

But to solve the basic issue in user code, all this needs is an annotation - of any kind. So I went ahead and added an Any.

Here is some sample code, run on Mypy strict:

from panel.widgets.input import StaticText

t1 = StaticText()

Before:

>> mypy panel_test_code.py --follow-imports=silent --strict
panel_test_code.py:3: error: Call to untyped function "StaticText" in typed context  [no-untyped-call]

After:

>> mypy panel_test_code.py --follow-imports=silent --strict
Success: no issues found in 1 source file

@MarcSkovMadsen

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 72.38%. Comparing base (2a53e2a) to head (00747c4).

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #7132      +/-   ##
==========================================
- Coverage   72.39%   72.38%   -0.01%     
==========================================
  Files         326      326              
  Lines       48827    48827              
==========================================
- Hits        35347    35343       -4     
- Misses      13480    13484       +4     

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[philippjfr]

Test failures are unrelated and are resolved elsewhere. I'm okay with this change for now. Adding typing for param is definitely on our to-do list but is definitely a very complex project.