[Feature][seatunnel-core] format the command usage help output

[legendtkl]

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Description

Now the usage help output looks poor readability as follows

./start-seatunnel-flink.sh -h
Usage: start-seatunnel-flink.sh [options] Options: -t, --check check config Default: false start-seatunnel-flink.sh start-seatunnel-spark.sh start-seatunnel-sql.sh -c, --config Config file -h, --help Show the usage message -r, --run-mode job run mode, run or run-application Default: RUN Possible Values: [RUN, APPLICATION_RUN] -i, --variable variable substitution, such as -i city=beijing, or -i date=20190318 Default: []

We can use JCommander.setUsageFormatter to produce a better looking.

Usage Scenario

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Related issues

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Are you willing to submit a PR?

• Yes I am willing to submit a PR!

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