[TRACKING ISSUE] [API-1320] Introduce various updates to Compact serialization implementation

The tracking issue for the Java side PR.

See https://github.com/hazelcast/hazelcast/pull/21734 for details.

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This is the compound PR for the tasks listed in JIRA task API-1320.

It contains the following changes

- Schema class now holds the fields in a HashMap instead of TreeMap
for faster lookups
- Various JavaDoc fixes for some classes
- Removing non-reachable dead codes around RabinFingerprint,
DefaultCompactWriter, and CompactInternalGenericRecord
- Mechanism to prevent duplicate field names in the Compact serializers
- Check for making sure that the Compact serializers registered
would not override the default serializers, unless explicitly
set by the user to do so.