chore: apply Prettier formatting and add formatting config

[Yasir-Rafique]

• Adds Prettier as a dev dependency and includes a .prettierrc configuration file.
• Applies Prettier formatting to the entire codebase (JavaScript files).
• This commit contains only formatting changes and Prettier setup.
• No code logic or functionality was changed.

Related to #1341.

[CLAassistant]

All committers have signed the CLA.

[Yasir-Rafique]

Hi! 👋

This PR implements the short-term solution discussed in #1341 by adding Prettier as a dev dependency, creating a .prettierrc config, and formatting the entire codebase for consistency.

If this approach works for you and the PR is merged, I’d be happy to move forward with the mid-term solution (documenting formatting in CONTRIBUTING.md, adding format scripts, etc.) and the long-term solution (integrating linting into CI) as next steps.

Let me know your thoughts or any preferences for the Prettier configuration!

[KernelDeimos]

Hi, this is a guaranteed merge conflict with everything, so we need to carefully time when we merge formatting changes or even incrementally merge different portions. For this reason, this PR should only contain the config, not the formatting changes.

[Yasir-Rafique]

As per the feedback, this PR now only adds the Prettier configuration files (.prettierrc and .prettierignore) and does not apply any formatting changes yet.