KAFKA-12154: Snapshot Loading API

[jsancio]

Implement Raft Snapshot loading API.

1. Adds a new method handleSnapshot to raft.Listener which is called whenever the RaftClient determines that the Listener needs to load a new snapshot before reading the log. This happens when the Listener's next offset is less than the log start offset also known as the earliest snapshot.

2. Adds a new type SnapshotReader<T> which provides a Iterator<Batch<T>> interface and de-serializes records in the RawSnapshotReader into Ts

3. Adds a new type RecordsIterator<T> that implements an Iterator<Batch<T>> by scanning a Records object and deserializes the batches and records into Batch<T>. This type is used by both SnapshotReader<T> and RecordsBatchReader<T> internally to implement the Iterator interface that they expose.

4. Changes the MockLog implementation to read one batch at a time. The previous implementation always read from the given offset to the high-watermark. This made it impossible to test interesting snapshot loading scenarios.

5. Removed throws IOException from some methods. Some of types were inconsistently throwing IOException in some cases and throwing RuntimeException(..., new IOException(...)) in others. This PR improves the consistent by wrapping IOException in RuntimeException in a few more places and replacing Closeable with AutoCloseable.

6. Updated the Kafka Raft simulation test to take into account snapshot. ReplicatedCounter was updated to generate snapshot after 10 records get committed. This means that the ConsistentCommittedData validation was extended to take snapshots into account.

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[jsancio]

Update the PR's description to match the latest changes included here.

[mumrah]

Thanks for the patch! First pass of questions/comments inline

[jsancio]

@mumrah @hachikuji @dengziming thanks for the feedback. I should have addressed all of your suggestions. Let me know if I missed anything.

[hachikuji]

LGTM. Thanks for the patch!