Add evaluate-math-expression extension

[DervexDev]

Description

Screencast

Checklist

• I read the extension guidelines
• I read the documentation about publishing
• I ran npm run build and tested this distribution build in Raycast
• I checked that files in the assets folder are used by the extension itself
• I checked that assets used by the README are placed outside of the metadata folder

[raycastbot]

Congratulations on your new Raycast extension! 🚀

Due to our current reduced availability, the initial review may take up to 10-15 business days

Once the PR is approved and merged, the extension will be available on our Store.

[pernielsentikaer]

@greptileai can you do a review here 😊

[greptile-apps]

PR Summary

This PR adds a new "Evaluate Math Expression" extension that reads selected text, evaluates it as a math expression, and outputs the result according to user preferences.

• In CHANGELOG.md, please use {PR_MERGE_DATE} instead of the hardcoded date "2025-02-15" - this will be automatically replaced with the current date upon merging
• In src/evaluate-math-expression.ts, error handling could be simplified with showFailureToast from @raycast/utils instead of the current showToast implementation
• The evaluate function is marked as async but doesn't contain any await operations
• Consider adding validation for empty text selection before evaluation
• The Preferences interface in preferences.ts is unnecessary as it's autogenerated in raycast-env.d.ts

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[greptile-apps]

style: Consider using Number(preferences.maxDecimals) instead of parseInt() to handle decimal values properly

[DervexDev]

@pernielsentikaer Done!