Rename NCP to CPG

[garious]

Problem

The control plane gateway is called the network control plane.

Proposed Solution

Rename the network control plane (NCP) to control plane gateway (CPG)

[garious]

A few more related name changes. I'd like to describe a fullnode has the composition of a 5 primary components: TPU, TVU, RPU, CPG, and DPG, where those are acronyms for the Transaction Processing Unit, Transaction Validation Unit, Request Processing Unit, Control Plane Gateway and Data Plane Gateway respectively.

So I propose the following changes:

• JSON RPC Service -> RPU
• NCP -> CPG
• BroadcastStage -> DPG

Alternatively, if we don't like the TLAs, I'd propose leaving JSON RPC Service as-is and changing just:

• NCP -> GossipService
• BroadcastStage -> BroadcastService

Thoughts on those names?

[garious]

@sagar-solana, @rob-solana, thoughts on names here? NCP is a terrible name. If we're going to change it, I'd like to use this as an opportunity to add consistency with other components.

Also, gossip is technically a form of broadcasting. Is there something more precise we can use to describe that data plane gateway? Maybe MulticastService? I'm looking for a word that is clearly not gossip or not the control plane.

[rob-solana]

could call it avalanche or whatever the new name is

[rob-solana]

NCP port could just be renamed to "gossip"

[rob-solana]

I think broadcast is as good a name as any for the data plane, and we use the term broadcast everywhere we talk about a leader's role