[FEATURE][Test Framework] Add support response payload validation to the epilogues

[hogesako]

Is your feature request related to a problem?

Currently only status code verification is available in the epilogues.
When testing asynchronous APIs, it may be necessary to wait for the epilogues to be processed until the process is complete.
Specifically, if we are testing a snapshot restore asynchronously, we must wait to delete the snapshot in the epilogue until the restore is complete.
This is because the following error occurs when deleting a snapshot while the restore is not completed.

ERROR   EPILOGUES
        ERROR   DELETE /_snapshot/{repository}/{snapshot} ([my-fs-repository:my-test-snapshot/KIVGLRXyR168qOKeAS1sIw] cannot delete snapshot during a restore in progress in [RestoreInProgress[{9gz8AVvDRPm9e2ZU8Gdw9A}{my-fs-repository:my-test-snapshot/KIVGLRXyR168qOKeAS1sIw}]])

I am not sure if there is a use case that requires response payload validation in prologues.

What solution would you like?

Add support response payload validation to the epilogues

What alternatives have you considered?

None

Do you have any additional context?

#611 (comment)