Add --json option to list CLI commands

[puneetdixit200]

Adds a --json flag to the list feeds and list entries CLI commands.

When used, output is emitted as JSON Lines (one JSON object per line), making it easier to use in scripts and pipelines.

Implementation details:

• Uses _json_default for serialization (handles dataclasses and datetime)
• Outputs JSON Lines (one object per line, not an array)
• Keeps existing plain-text output unchanged

Tests:

• Added tests for --json output
• Updated tests to remove deprecated catch_exceptions argument from CliRunner

Example usage:

python -m reader list feeds --json
python -m reader list entries --json

[Copilot]

Pull request overview

Adds a --json flag to the reader list feeds and reader list entries CLI commands to support JSON Lines output for scripting/pipelines, while keeping the existing plain-text output as the default.

Changes:

• Add --json option to list feeds and list entries.
• Serialize feed/entry objects to JSON (currently via _hash_utils._dataclass_dict and json.dumps()).

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[puneetdixit200]

@lemon24 Should I implement changes recommend by copilot?

[lemon24]

Left some comments (some as replies to the Copilot ones).

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 94.28%. Comparing base (54552cb) to head (a271775).
⚠️ Report is 1 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #399   +/-   ##
=======================================
  Coverage   94.27%   94.28%           
=======================================
  Files         103      103           
  Lines       13510    13529   +19     
  Branches      997      999    +2     
=======================================
+ Hits        12737    12756   +19     
  Misses        692      692           
  Partials       81       81           

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[lemon24]

Looks good, after this round of comments it should be good to go!

[lemon24]

Per previous comment, this docstring should be left unchanged (no additions, no removals).

[lemon24]

Still missing the "Outputs one line per entry in the following format: ..." part, I'll fix it after merge.

[lemon24]

@puneetdixit200, thank you for the PR!