Feat: add multisig creation on project signup

[daodesigner]

During Prague Round, some projects were confused on wether they should receive funds via multisig or EOA and on what network. Ultimately we had issues where payouts happened on a different network than where gnosis safe was deployed. This feature would remedy this by building the project signup process into the UI and deploying multisigs for all the recipients on the fly. The goal is to make it as easy as possible for non technical people to apply to participate, blackboxing this process would be a great start.

credit to @chrishobcroft for the idea and all the energy spent into onboarding deeply non-tech folks at the event.