chore: clean ingestor code

[bonustrack]

Currently in the ingestor code there is a lot of manipulations for example here where we build another object just to be in a format that works with the ingestor function:
https://github.com/snapshot-labs/snapshot-sequencer/blob/master/src/ingestor.ts#L111-L123
There is no typing too, we should try to clean this part.

[Sekhmet]

To get more context, do we here want to still keep ingestor functionality (input A goes in, we transform it to new format, new format is used in actions) or the goal here is to get rid of transformations and use raw input in actions itself?

[bonustrack]

The goal is to get rid of transformation, format is already enforced by the EIP 712 type