Add linting and formatting configuration

[jarmentor]

Opening a PR for #35.

I believe that this configuration keeps to the standard previously set in the codebase while accounting for the concerns mentioned in the issue

This PR contains a particularly large amount of changes due to formatting adjustments having been applied across the codebase.

Summary

• adds client eslint configuration based on existing codebase
• adds client prettier configuration based on existing codebase
• adds blank client quick-lint-js configuration
• adds server eslint configuration
• adds server prettier configuration
• adds blank server quick-lint-js configuration
• adds .editorconfig to client and server directories
• formats the codebase to defined standards
• updates of scripts available in package.json (details below)
• Adds proptype validation to client codebase.
• Adds a package-lock.json file to the src/client directory similar to the one in src/server

Additional Scripts: client and server package.json scripts added:

• lint - runs eslint on the client directory
• lint:fix - runs eslint on the client directory fixing the fixable issues
• prettier - runs prettier on the client directory
• prettier:fix - runs prettier on the client directory fixing the fixable issues
• preflight - runs eslint and prettier on the client directory
• preflight:fix - runs eslint and prettier on the client directory

Notes:

• [X] All client tests were run and passed
• [X] No new tests were added with this change
• On the server, please note that I've removed unused imports. If this is not acceptable I can revert this change.

Please let me know of any feedback or tweaks to this configuration after your review. Thanks!