Implement peer re-negotiation

[Geod24]

It is possible for one of our peers to change stake:

agora/source/agora/node/Validator.d

Lines 337 to 339 in 14459dd

	auto enroll_key = this.enroll_man.getEnrollmentKey();
	Identity id = Identity(this.config.validator.key_pair.address,
	enroll_key == Hash.init ? this.getFrozenUTXO() : enroll_key);

For example, in the following set of events:

• Node starts with a pubkey, registers as validator because of Divide peers into three categories and apply proper limitation to them #2867 ;
• A stake is created, the node picks it up and try to enroll (if recurring_enrollment is enabled);
• The stake might get destroyed, and another one created, and the node will pick it up, too;

At any point, the node might establish connections, meaning it can be seen from different clients with different, potentially outdated, stakes.
Currently there is no way to re-negotiate a connection (re-do the 'handshake'), nor is there a clean way to tear-down all connections and restart them.

[Geod24]

To do this, we might have to dig into both the RPC client and Vibe.d.
It's acceptable to only implement it for the RPC client for now if necessary, but it will need to also work with Localrest.

The first step I was looking into was subclassing RestInterfaceClient, but it's only useful if we can have a persistent connection, which means storing the HTTPClient, which is not currently the case:
https://github.com/vibe-d/vibe.d/blob/b3818391b397616b20dd0c9b842e369b1e74a6d6/web/vibe/web/rest.d#L2051-L2053

Called from:
https://github.com/vibe-d/vibe.d/blob/b3818391b397616b20dd0c9b842e369b1e74a6d6/web/vibe/web/rest.d#L822-L824

Which is a method we could override, but currently we'd need to copy-paste a lot of code to make it work.

[omerfirmak]

nor is there a clean way to tear-down all connections and restart them.

I am wondering if LocalRest channels could be used to make this easier to implement, a dynamic set of peers.