chore: add clippy configuration file

[Athemis]

Summary

• This adds a clippy configuration file to allow customization of clippy's behaviour

Testing

• cargo fmt
• cargo clippy --all-targets --all-features
• cargo test
• cargo doc --no-deps
• Other: N/A

Platforms exercised (mark all that apply):

• Windows
• macOS
• Linux

Docs/metadata

• README/CONTRIBUTING updated if behavior or commands changed
• User Guide updated (if user-facing change)

Notes for reviewers

Summary by CodeRabbit

• Chores
  • Updated internal linting configuration settings to improve code quality checks during development.

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[coderabbitai]

Walkthrough

This change modifies the Clippy configuration file to disable the avoid-breaking-exported-api lint and enable the check-inconsistent-struct-field-initializers lint. These adjustments refine the static analysis rules applied to the codebase during compilation.

Changes

Cohort / File(s)	Summary
Clippy Configuration clippy.toml	Added two linting configuration directives: avoid-breaking-exported-api = false disables warnings about API-breaking changes, and check-inconsistent-struct-field-initializers = true enables detection of inconsistent struct field initialization patterns.

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~3 minutes

Poem

⚙️ A directive refined, through Clippy's keen eye,
Configuration commands that quietly fly,
Structure and API now dance to new rules,
The compiler's vast wisdom, its analytical tools. 🔧

🚥 Pre-merge checks | ✅ 3

✅ Passed checks (3 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title accurately describes the main change: adding a clippy configuration file to the repository.
Description check	✅ Passed	The description covers all required template sections with appropriate detail and testing verification across all specified cargo commands.
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 unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch chore/clippy-config

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