[core-p2p] Restrict internal routes to whitelisted forger(s)

[air1one]

Implement the internal route restriction to whitelisted forger(s) : it is implemented on 2.6 branch so you might have a look (search for isForgerAuthorized).

On 3.0 this would need to be done as a plugin (like packages/core-p2p/src/socket-server/plugins/accept-peer.ts for example, you would plug the plugin on the same onPreHandler hook).

Basically all incoming requests for internal routes (see packages/core-p2p/src/socket-server/routes/internal.ts) should be only allowed to whitelisted forger (we whitelist forger using remoteAccess config parameter, see packages/core-p2p/src/defaults.ts)