fix(plugin-meetings): moved cluster reachability functionality to new…

[venky-mediboina]

… class pr1

COMPLETES # SPARK-610518

This pull request addresses

As changes are somewhat big, we split into 3 PRs. Old combined PR: #4542.

This is the first PR of 3 PRs to add subnet details which consists of each subnet IP in the details section including whether its reachable or not.

As part of this PR-1, created new class(ReachabilityPeerConnection) to handle each cluster as instance in ClusterReachabilty class for now.

by making the following changes

< DESCRIBE YOUR CHANGES >

Change Type

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)
• Documentation update
• Tooling change
• Internal code refactor

The following scenarios were tested

< ENUMERATE TESTS PERFORMED, WHETHER MANUAL OR AUTOMATED >

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