Cairo native feature flag

[3alpha]

Resolves #826. Doesn't do anything for performance, but it is good to have it in here. Currently only available when compiling from source with a feature flag. Whether we will ship docker images with it is TBD.

Usage related changes

Development related changes

Checklist:

• Checked out the contribution guidelines
• Applied formatting - ./scripts/format.sh
• No linter errors - ./scripts/clippy_check.sh
• No unused dependencies - ./scripts/check_unused_deps.sh
• No spelling errors - ./scripts/check_spelling.sh
• Performed code self-review
• Rebased to the latest commit of the target branch (or merged it into my branch)
  • Once you make the PR reviewable, please avoid force-pushing
• Updated the docs if needed - ./website/README.md
• Linked the issues resolvable by this PR - linking info
• Updated the tests if needed; all passing - execution info

Summary by CodeRabbit

• New Features

  • Native code execution is now available as an optional feature for improved performance.

• Documentation

  • Added guidance on enabling native execution in build and deployment instructions, including runtime confirmation messages.

[3alpha]

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Walkthrough

This pull request introduces support for the cairo_native execution feature across the codebase. It adds a new cairo_native feature flag to four Cargo manifest files (starknet-devnet-core, starknet-devnet-server, starknet-devnet-types, and starknet-devnet), with dependencies on blockifier/cairo_native and starknet-types/cairo_native. Additional changes include updating the CI workflow to install LLVM 19 and extend cargo check with --all-features, bumping Starknet dependencies to 0.16.0-rc.3, adding documentation about the feature in the README and installation guide, and adding a conditional log message at startup when the feature is enabled.

Estimated code review effort

🎯 2 (Simple) | ⏱️ ~12 minutes

🚥 Pre-merge checks | ✅ 2 | ❌ 1

❌ Failed checks (1 inconclusive)

Check name	Status	Explanation	Resolution
Description check	❓ Inconclusive	The PR description lacks detailed content in both required sections and provides minimal context for reviewers.	Add detailed descriptions under 'Usage related changes' and 'Development related changes' sections explaining how users and developers are affected by the cairo_native feature implementation.

✅ Passed checks (2 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title 'Cairo native feature flag' directly and specifically describes the main change—introducing a new cairo_native feature flag across multiple Cargo manifests and documentation.
Docstring Coverage	✅ Passed	Docstring coverage is 100.00% which is sufficient. The required threshold is 80.00%.

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✨ Finishing touches

• 📝 Generate docstrings

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch cairo-native-feature-flag

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