VersionRange additions

[rukai]

This PR introduces 2 new pieces of functionality around VersionRange.
These were required to implement a unit test in my project that compares the currently supported versions of the project against the supported versions of the kafka-protocol crate.

The additions are:

• Add PartialEq impl for VersionRange
  • allows for direct comparison between ranges which seems like a reasonable operation.
• Add Display impl for VersionRange
  • It takes the format 0..10 where min is 0 and max is 10
  • This compact format will be nice for logs and error messages.
  • Possibly we should do 0 to 10 or 0-10 or 0..=10 instead, since in regular rust 0..10 would mean an exclusive 10.