Java 17: Start using records

[iluwatar]

Available since Java 16, we can now use the record type for immutable classes. It's well described at https://dzone.com/articles/what-are-java-records

Acceptance criteria

• The repository code has been refactored to use the record type

[ayushanand308]

@iluwatar can you assign this issue to me?

[bharathkalyans]

Hey is this issue still in-progress, can I help with it??

[iluwatar]

Assigned to @ayushanand308, but maybe there's a way to split the work?

[bharathkalyans]

I think @ayushanand308 is not quite active right now!!
Sure, would love to split the work 😃

[iluwatar]

Reassigned to @bharathkalyans due to inactivity