Remove `accounts` config from Dirk signer

[ManuelBilbao]

Dirk users may have thousands of accounts and it's not reasonable to set them all in the config. The easiest option to solve this is to just ask for the wallets to use (Dirk doesn't allow to get "all wallets" accounts) and load all accounts of those. This is as simple as removing the checks like this one.

commit-boost-client/crates/signer/src/manager/dirk.rs

Lines 603 to 605 in f776bca

	if !host.accounts.contains(&account.name) {
	continue;
	}

The caveat here is that we might be loading previously generated proxy keys as consensus ones. Possible options to solve this I've thought were:

• Use a different specific wallet for proxy keys.
• Set a standard for proxy key names and treat keys as proxies if the name matches the standard