feat(cli): add --[no-]color flag to control output colorization

[AndyBodnar]

This addresses issue #1031.

When calling the CDK CLI programmatically (e.g., from a subprocess), colors are automatically disabled because stdout isn't a TTY. This makes it difficult to capture colored output for tools that want to preserve formatting.

I've added a --color flag to indicate color output is desired. The --no-color flag takes priority if both are specified.

I also fixed a subtle bug where the existing --no-color flag wasn't actually being used - the color disabling was happening at module load time before arguments were even parsed. Now both flags work correctly and respect the priority order: --no-color > --color > TTY detection.

Tested locally and added unit tests covering all the new behavior.

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By submitting this pull request, I confirm that my contribution is made under the terms of the Apache-2.0 license

[mrgrain]

Hey, appreciate the fix! Semantically, the cli options should be this:

[no option provide] - automatic detection
--color - always show color
--no-color - never show color

We don't currently use color levels, so I am not very keen to introduce them as an external option.

[mrgrain]

see comment

[AndyBodnar]

Simplified to just --color as a boolean. When passed it forces truecolor output, otherwise auto-detection kicks in as usual. Also kept the fix for --no-color not being respected at module load time.

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 87.71%. Comparing base (e966a35) to head (dcd3743).

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1030      +/-   ##
==========================================
+ Coverage   87.69%   87.71%   +0.01%     
==========================================
  Files          72       72              
  Lines       10095    10102       +7     
  Branches     1332     1335       +3     
==========================================
+ Hits         8853     8861       +8     
+ Misses       1217     1216       -1     
  Partials       25       25              

Flag	Coverage Δ
suite.unit	87.71% <100.00%> (+0.01%)	⬆️

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rico approved