feat(alias): implement signing with alias

[Todmy]

Context

Discussed here. Related issue #3852(snapshot). FE implemented here.

Aliases are kind of a session that can be used by snapshot for the automatic signing of messages. It removes the annoying MetaMask sign prompt.

Aliases are stored in the aliases table in the snapshort-sequencer DB.

Possible solutions:

• store alias near address in the subscribers table.
• query from snapshot-hub extra field alias

The first option is a little bit better. By adding the redundant column alias in the subscribers table we can cut off part of redundant requests to snapshot-hub