[CLI-3313] Resume Flink statement along with principal and/or compute_pool ID update

[channingdong]

Summary:

This PR supports the feature of resume the Flink statement with a different principal/compute_pool.

Namely when stopped parameter has change from true -> false, we can update the principal and/or compute_pool in place and avoid recreating the Flink statement resource.

Code changes:

• Split the flinkStatementUpdate() into flinkStatementStop() and flinkStatementResume() due to different behaviors in the process of stop and resume.
• Add custom diff function resourceFlinkStatementDiff() to remind and avoid users running into invalid scenarios when initiating stop or resume.
• Update the Flink statement to remove RESUMING statement status.
• Add associated Terraform acceptance tests.
• Update the resource docs as instruction.

Reference:

This PR also updates the Flink statement status type according to the latest DML flow here: https://confluentinc.atlassian.net/wiki/spaces/FLINK/pages/3420389383/Refine+the+Customer+Facing+Statement+Status#Finite-State-Machine-Definitions-and-Logic-for-Flink-in-Confluent-Cloud

The whole verification for Terraform is done and documented in the docs below.

Testing Done:

https://docs.google.com/document/d/1dutVZmbEwJBBqMzx57uCXqllV1SEr2vxnjUrtTPCwBk/edit?usp=sharing

[confluent-cla-assistant[bot]]

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