### What changes were proposed in this pull request?
Support Flink 2.0. The major changes of Flink 2.0 include:
- https://github.com/apache/flink/pull/25406: Bump target Java version to 11 and drop support for Java 8.
- https://github.com/apache/flink/pull/25551: Replace `InputGateDeploymentDescriptor#getConsumedSubpartitionIndexRange` with `InputGateDeploymentDescriptor#getConsumedSubpartitionRange(index)`.
- https://github.com/apache/flink/pull/25314: Replace `NettyShuffleEnvironmentOptions#NETWORK_EXCLUSIVE_BUFFERS_REQUEST_TIMEOUT_MILLISECONDS` with `NettyShuffleEnvironmentOptions#NETWORK_BUFFERS_REQUEST_TIMEOUT`.
- https://github.com/apache/flink/pull/25731: Introduce `InputGate#resumeGateConsumption`.
### Why are the changes needed?
Flink 2.0 is released which refers to [Release notes - Flink 2.0](https://nightlies.apache.org/flink/flink-docs-master/release-notes/flink-2.0).
### Does this PR introduce _any_ user-facing change?
No.
### How was this patch tested?
CI.
Closes#3179 from SteNicholas/CELEBORN-1925.
Authored-by: SteNicholas <programgeek@163.com>
Signed-off-by: Weijie Guo <reswqa@163.com>
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