[FLINK-29126][hive] Fix wrong logic for spliting file for orc format

[luoyuxia]

What is the purpose of the change

To fix the file split optimizatioin doesn't work for orc format.

Brief change log

• Change"orc".equalsIgnoreCase(serializationLib) to !serializationLib.toLowerCase().contains("orc") to check whether it's orc format or not, since the serializationLib for orc format is actually OrcSerde .

• optimization that enables multiple threads to calcalute total files' size .

Verifying this change

UT in HiveSourceFileEnumeratorTest.java

Does this pull request potentially affect one of the following parts:

• Dependencies (does it add or upgrade a dependency): (yes / no)
• The public API, i.e., is any changed class annotated with @Public(Evolving): (yes / no)
• The serializers: (yes / no / don't know)
• The runtime per-record code paths (performance sensitive): (yes / no / don't know)
• Anything that affects deployment or recovery: JobManager (and its components), Checkpointing, Kubernetes/Yarn, ZooKeeper: (yes / no / don't know)
• The S3 file system connector: (yes / no / don't know)

Documentation

• Does this pull request introduce a new feature? (yes / no)
• If yes, how is the feature documented? (not applicable / docs / JavaDocs / not documented)

[flinkbot]

CI report:

• c391d6a3779a54a3de268ce1ca40768559715975 Azure: SUCCESS

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[luoyuxia]

@godfreyhe I have addressed your comments. Could you please help review again when you're free.