Add new configuration allowing to keep processing when there are fatal exceptions or timeout

[yehaolan]

Changes

1. Create configuration “task.commit.skip.commit.during.failures.enabled” with default to false. When the config is set to true, decouple the fatal checkpoint errors and commit timeouts from data processing
2. Create new metric “commit-exceptions-ignored” denoting the counter of the ignored exceptions
3. Create new metric “last-async-commit-ns” denoting the finish timestamp last successfully async
4. Update error / timeout handling mechanism with the config setting to true.

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Tests

• executed ./gradlew build
• unit test in TestTaskInstance.scala