[Improve][JsonUtils] Use a static object mapper instead of creating it every time

[Morssssy]

[Improve][JsonUtils] Use a static object mapper instead of creating it every time

Purpose of this pull request

ObjectMapper class consumes a certain amount of system resources during instance creation. Instances of ObjectMapper should be reused.

Check list

• Code changed are covered with tests, or it does not need tests for reason:
• If any new Jar binary package adding in your PR, please add License Notice according
  New License Guide
• If necessary, please update the documentation to describe the new feature. https://github.com/apache/seatunnel/tree/dev/docs
• If you are contributing the connector code, please check that the following files are updated:
  1. Update change log that in connector document. For more details you can refer to connector-v2
  2. Update plugin-mapping.properties and add new connector information in it
  3. Update the pom file of seatunnel-dist
• Update the release-note.

[ruanwenjun]

@Morssssy Please solve the code style by mvn spoless:apply

[Morssssy]

@Morssssy Please solve the code style by mvn spoless:apply

done

[ruanwenjun]

+1

[ruanwenjun]

Could you please rebase your dev branch with upstream dev.

[liugddx]

Please merge the latest dev branch.

[Morssssy]

@ruanwenjun @liugddx DONE

[liugddx]

@ruanwenjun @liugddx DONE

Please wait for CI to complete.