feat(cli): set max terminal width based on terminal

[mkniewallner]

PR Checklist

• A description of the changes is added to the description of this PR.
• If there is a related issue, make sure it is linked to this PR.
• If you've fixed a bug or added code that should be tested, add tests!
• If you've added or modified a feature, documentation in docs is updated

Description of changes

By default, click wraps lines at 80 characters. This makes the command descriptions in help command hard to read properly IMO:

Per the documentation, there is a way to change that. Using shutil.get_terminal_size should be a sensible choice, as it will first check if the terminal provides the right information, then the OS if not, then fallback to a default 80 value (which is already what we have) if neither do.

On a full-size terminal, with a 1920x1080 screen resolution, this looks like this:

[codecov]

Codecov Report

Attention: Patch coverage is 60.00000% with 2 lines in your changes missing coverage. Please review.

Project coverage is 92.3%. Comparing base (ce87735) to head (e3c1703).
Report is 1 commits behind head on main.

Files	Patch %	Lines
python/deptry/cli.py	60.0%	2 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##            main    #817     +/-   ##
=======================================
- Coverage   92.5%   92.3%   -0.2%     
=======================================
  Files         36      36             
  Lines        961     965      +4     
  Branches     173     173             
=======================================
+ Hits         889     891      +2     
- Misses        56      58      +2     
  Partials      16      16             

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