feature: impl Default for Value

[joshmossas]

This makes it to where Value implements the Default trait. Calling Value::default() creates Value::Null.

Summary by CodeRabbit

• Refactor
  • Improved internal implementation of the Value type by establishing a default value representation, enhancing usability for library consumers.

[coderabbitai]

📝 Walkthrough

Walkthrough

The Value enum in arri_repr/src/value.rs now derives the Default trait, with the Null variant designated as the default value for the type.

Changes

Cohort / File(s)	Summary
Default Trait Implementation arri_repr/src/value.rs	Added Default derive to Value enum and marked Null variant with #[default] attribute.

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~2 minutes

Poem

🐰 A Null default hops into place,
No more empty trait to trace,
The Value enum stands so tall,
With Default catching all,
A simple change, but oh so right!

🚥 Pre-merge checks | ✅ 3

✅ Passed checks (3 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title accurately describes the main change: implementing the Default trait for the Value type.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.

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✨ Finishing touches

• 📝 Generate docstrings

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
⚠️ Please upload report for BASE (main@282912d). Learn more about missing BASE report.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #260   +/-   ##
=======================================
  Coverage        ?   91.83%           
=======================================
  Files           ?       30           
  Lines           ?     1642           
  Branches        ?        0           
=======================================
  Hits            ?     1508           
  Misses          ?      134           
  Partials        ?        0           

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[Arthurdw]

Thanks for the contribution, will make a patch release in a sec.