Uniffle Release 0.7.1

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Improvements
- Refresh application when reading memory data to prevent application from being expired.
Major bug fixes
- Cache proxy user ugi to avoid memory leak.
- Make metric reporter usable by fixing some logic errors.
- Close ShuffleWriteClient after task was completed to exit container process.
- Make sure 'finishShuffle' invoked after all shuffle data sent.
- Update local storage metadata for all related events instead of just the first event.
- Correct a wrong metric, grpc_server_connection_number.
Minor bug fixes
- Avoid returning null in defaultUserApps when quote file doesn't config user.
- Fix LocalStorageManager divide by zero exception.

[ISSUE-669] improvement: refresh application when reading memory data (#741)
Bump project version to 0.7.1-SNAPSHOT
[ISSUE-772] fix(kerberos): cache proxy user ugi to avoid memory leak (#773)
Revert "[ISSUE-772] fix(kerberos): cache proxy user ugi to avoid memory leak (#773)
[ISSUE-796][0.7] bug: Fix the issues of MetricReporter (#821)
[MINOR][0.7] Avoid returning null in defaultUserApps when quota file doesn't config user (#822)
[ISSUE-772] fix(kerberos): cache proxy user ugi to avoid memory leak (#773)
Revert "[ISSUE-772] fix(kerberos): cache proxy user ugi to avoid memory leak (#773)
[ISSUE-772][0.7] fix(kerberos): cache proxy user ugi to avoid memory leak (#773)
[ISSUE-715] fix(mr): The container does not exit because shuffleclient is not closed (#882)
[ISSUE-886] fix(mr): MR Client may lose data or throw exception when rss.storage.type without MEMORY (#887)
Revert "[ISSUE-886] fix(mr): MR Client may lose data or throw exception when rss.storage.type without MEMORY (#887)
[MINOR] fix: Fix LocalStorageManager divide by zero exception (#900)
[ISSUE-881][0.7] fix(followup): Ensure LocalStorageMeta disk size is correctly updated when events are processed for 0.7.0 (#914)
[ISSUE-933][0.7] fix: incorrect metric grpc_server_connection_number (#941)
change version to 0.7.1 release