8371549: [CRaC] Implement C/R in Selector on non-Linux

[rvansa]

Historically we have an extensive set of tests for java.nio.channels.Selector. However this runs only on Linux (using CRIU) rather than being platform agnostic and tested on all platforms. On Linux, it does not exercise PollSelectorImpl (this can be preferred using a system property) either - just the default EpollSelectorImpl.

This PR enables testing on all available Selector implementations, cleans up the implementation of those tests and introduces the C/R implementations.

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Progress

• Change must not contain extraneous whitespace

Issue

• JDK-8371549: [CRaC] Implement C/R in Selector on non-Linux (Task - P4)

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@rvansa This change now passes all automated pre-integration checks.

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8371549: [CRaC] Implement C/R in Selector on non-Linux

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