Add a warning when capitalized booleans (improper JSON) appear in query

[cbkerr]

The warning from signac.filterparse._cast is burried in the shell and automatically searching for capitalized boolean string is likely not the expected result.

Description

Make the feedback when searching for booleans in incorrect JSON more like signac find:

$ signac find a True
Did you mean true?
Interpreted filter arguments as '{"a": "True"}'.

Motivation and Context

You would have to look at the shell to see these messages about casting of True-->true.

They come from signac.filterparse._cast

127.0.0.1 - - [14/Feb/2024 09:25:36] "POST /login HTTP/1.1" 302 -
Did you mean true?
Did you mean false?
Interpreted filter arguments as '{"a": "True"}'

Related to glotzerlab/signac-docs#199

Checklist:

• I am familiar with the Contributing Guidelines.
• I agree with the terms of the Contributor Agreement.
• The changes introduced by this pull request are covered by existing or newly introduced tests.
• The package documentation and framework documentation in signac-docs are up to date with these changes.
• I have updated the changelog and added any related issue and pull request numbers for future reference.

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 6 lines in your changes are missing coverage. Please review.

Project coverage is 69.55%. Comparing base (0a65622) to head (44ce715).
Report is 5 commits behind head on main.

❗ Current head 44ce715 differs from pull request most recent head 0be77c8. Consider uploading reports for the commit 0be77c8 to get more accurate results

Files	Patch %	Lines
signac_dashboard/dashboard.py	0.00%	3 Missing and 3 partials ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #213      +/-   ##
==========================================
- Coverage   70.02%   69.55%   -0.48%     
==========================================
  Files          21       21              
  Lines         884      890       +6     
  Branches      159      162       +3     
==========================================
  Hits          619      619              
- Misses        220      223       +3     
- Partials       45       48       +3     

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[joaander]

Thanks! This looks fine after the suggested rephrasing of the message.