Allow non owners to use spending limit

[tschubotz]

What is this feature about? (1 sentence)

This will allow accounts who are not an owner of a Gnosis Safe to use the spending limit feature.

Why is it needed? What is the value? For whom do we build it?

• Spending limits was introduced with #413
• Users can specify a spending limit for any address.
• Currently, via our UI, we only allow owner accounts to actually spend funds. This limits the use.

High-level overview of the feature

Details are tbd.

• When an address/wallet is connected where a spending limit is set for, the "new transaction" button gets enabled and they can make a spending limit tx.
• Where we display "read only", we display "Spending limit" or "Limited"

[tschubotz]

Feedback/ feature request from @pablofullana : manage spending limit for groups of addresses rather than for specific addresses only. i.e. instead of having to set 10x a spending limit of 10GNO, would be good to batch that.

[tschubotz]

There was another feature request for this on Discord. https://discord.com/channels/477106835862716416/477391201708802058/801796243918553129