chore: Add .clangd to .gitignore

[limbonaut]

Ignore the .clangd configuration dir which is user-specific and should not be tracked in the repository.

The .cache directory (clangd's index cache) was already ignored.

[github-actions]

Semver Impact of This PR

🟢 Patch (bug fixes)

📋 Changelog Preview

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New Features ✨

• (options) Support SENTRY_DSN, SENTRY_RELEASE, and SENTRY_ENVIRONMENT env vars by limbonaut in #548
• Add shutdown_timeout_ms option by limbonaut in #539

Documentation 📚

• Add README files for addon and demo project packages by limbonaut in #547
• Update Web platform support information in README by limbonaut in #536

Internal Changes 🔧

Deps

• Update Native SDK to v0.13.1 by github-actions in #544
• Update Native SDK to v0.13.0 by github-actions in #533
• Update Sentry Android to v8.33.0 by github-actions in #531
• Update wasm-split to v26.2.1 by github-actions in #534
• Update Sentry JavaScript to v10.40.0 by github-actions in #540

Other

• (web) Optimize file attachment loading in WASM bridge by limbonaut in #538

• Add .clangd to .gitignore by limbonaut in #552

• Use better AssetLib icon by limbonaut in #549
• Add GH_TOKEN and harden AssetLib workflow by limbonaut in #546
• Automate AssetLib updates on release by limbonaut in #545
• Generate a separate package with demo project by limbonaut in #542
• Exclude MSVC linker byproducts from build artifact by limbonaut in #543
• Run CI on all PRs regardless of changed paths by limbonaut in #541

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