MINOR: Cleanup Trogdor Module

[sjhajharia]

Now that Kafka support Java 17, this PR makes some changes in trogdor
module. The changes mostly include:

• Collections.emptyList(), Collections.singletonList() and Arrays.asList() are replaced with List.of()
• Collections.emptyMap() and Collections.singletonMap() are replaced with Map.of()
• Collections.singleton() is replaced with Set.of()

Some minor cleanups around use of enhanced switch blocks and conversion of classes to record classes.

[m1a2st]

Thanks @sjhajharia for this patch, left some comments

[sjhajharia]

Thank you @m1a2st and @Pankraz76 for the reviews. I have addressed them.
Requesting a re-review when possible.
TIA!