[KV] Bump RocksDB version to 11.8.1

[platinumhamburg]

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Motivation

Fluss currently depends on com.ververica:frocksdbjni:6.20.3-ververica-2.0, which is based on RocksDB 6.20.3. We should bump RocksDB to 11.8.1 by switching to the first official release of the Fluss-maintained RocksDB JNI distribution: io.github.fluss-contrib:fluss-rocksdbjni:11.8.1-fluss-2.

The task should cover the dependency and Java package migration, as well as the API compatibility changes required by RocksDB 11.8.1. In particular:

• Replace the FRocksDB dependency and org.rocksdb imports with the Fluss RocksDB JNI artifact and org.fluss.rocksdb package.
• Adapt the TTL compaction filter and iterator APIs to their RocksDB 11.8.1 equivalents.
• Keep RocksDB checkpoint and incremental snapshot handling compatible with empty files such as newly generated WAL files.
• Update the bundled dependency notices.

The existing RocksDB KV, TTL compaction, and snapshot tests should pass with the new JNI artifact, and the Fluss client and server artifacts should no longer contain references to FRocksDB.

Solution

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Anything else?

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Willingness to contribute

• I'm willing to submit a PR!