Increase bulk size from 100 -> 500

[MatusKysel]

Currently have fixed limit of bulk validators https://github.com/ssvlabs/ssv-dkg/blob/unstable/cli/utils/utils.go#L362 set to 100.

For increasing this we should consider changing following values:
https://github.com/ssvlabs/ssv-dkg/blob/unstable/pkgs/initiator/initiator.go#L113
https://github.com/ssvlabs/ssv-dkg/blob/unstable/pkgs/wire/dkg.go#L37

and probably implementing this

// FastSync is a mode where nodes sends pre-emptively responses indicating
	// that the shares they received are good. If a share is invalid, a
	// complaint is still sent as usual. This has two consequences:
	//  - In the event all shares are good, nodes don't need to wait for the
	//  timeout; they can already finish the protocol at the point.
	//  - However, it requires nodes to send more messages on the network. We
	//  pass from a O(f) where f is the number of faults to a O(n^2). Note that
	//  the responses messages are small.
	FastSync [bool](https://pkg.go.dev/builtin#bool)

source https://pkg.go.dev/github.com/drand/kyber/share/dkg

With this flag enabled, we should be able to run the DKG ceremony faster, but it will increase the number of messages on the network.

[RaekwonIII]

Yes plz 🙏