Deprecate Moment.js and Migrate to Modern Date/Time Handling Libraries

[mariuszr]

We should stop using Moment.js because it has been in maintenance mode for some time and there are no plans for future feature updates. It's better to switch to modern alternatives like date-fns, Luxon, or native JavaScript APIs, as they offer improved performance, smaller bundle sizes, and better timezone handling. This update will help us keep the project maintainable and in line with current best practices for date and time manipulation.

Additional context

• Moment.js is officially in maintenance mode: Moment.js Project Status.
• Some known issues with Moment.js include the large bundle size, lack of immutability, and timezone limitations, which have been pointed out by the community. Using modern alternatives would align the project with best practices and reduce technical debt in the long run.

CC: @akhenry @jvigliotta