Add wrapUp() for GHEventPayload.CheckSuite

[XiongKezhi]

Description

Added a warp up method for check suite.

It seems the JavaDoc and tests are not needed because I see other payload objects also don't provide them for their warpUp() method. I will add them if required.

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[bitwiseman]

I'd like to get events better tested, but that doesn't need to happen in this PR.