Gossip for Componentization

[lpetrovic05]

This is a work in progress epic for componentizing networking in order to support dynamic member changes.
Link to design diagram

Notes:

• Since most of the threads in this subsystem are IO blocking, we must adjust the queues in such a way to prevent the starvation of task schedulers
• We can drop support for non fully connected networks, as long as it's easy to add back later
• We can drop support plain TCP without TLS
• It's ok to drop support for connecting to local nodes with local IP address for the time being. As part of the DAB project, we may add support for a list of IPs which can be both local and public

Prep

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1. Create design for gossip DAB support #11520
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2. Flatten Gossip class #11506
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3. Remove unidirectional networks - no longer supported. #11796
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4. Create PeerInfo record #11835
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5. ConnectionManager should have ID
6. Investigate if a new server socket needs to be created when adding/removing nodes #12299
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7. Create api for dynamic protocol creation #11919
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8. Move to fully connected network #12984
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Tasks

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1. Decouple socket factory #11732
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2. Create utility for validating TLS certificates #11762
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3. Componentize ConnectionServer #11727
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4. Update OutboundConnectionCreator & InboundConnectionHandler #11735
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5. Componentize InboundConnectionHandler #11734
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6. Redefine protocols #11739
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7. Create ConnectivityManager #11820
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8. Create PeerManager #11821
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9. Remove support for plain TCP #12414
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10. Make ConnectivityManager dynamic. #12943
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11. ConnectionServer should output socket+peerlist. Look in #11727 for more details. #12944
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12. Create a wrapper class for connectivity components. #12945
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