Abi - Refactor / Gen

[arboleya]

• [ ] Refactor and move abi-typegen into it
• [ ] Plug existent strategies with abi/parser public interface
• [ ] Prepare the foundation for multiple output format (Javascript)

[petertonysmith94]

We should rethink the need for the Vec helper type as it's essentially the same as Array<T> or T[].

_Originally posted by @nedsalk in https://github.com/FuelLabs/fuels-ts/pull/3046#discussion_r1740358518_

[petertonysmith94]

• We will move the static storageSlots variable from the Contract (e.g. MyTypegenContract.storageSlots) to the Factory (e.g. MyTypegenContractFactory.storageSlots). As it is only relevant for deployment purposes.
• This is a breaking change, so we should make note on the relevant PR of this.