[UI][Feature] signing and resolving proposal together with creating proposal

[rueshyna]

Current state:

• When a proposal is created, it will display on the proposal page with signing and "Try to resolve immediately " option.

Change:

• When a proposal is creating, display the checkbox "Sign immediately" with default check
• If the threshold of the proposal is 1 and the checkbox of "sign immediately" is checked, display another checkbox "Resolve immediately"

Notice that there are two ways of creating proposal:

• from the new proposal page by users
• through beacon connection by dapps

[Pilou97]

closing the issues since https://github.com/marigold-dev/tzsafe-ui/pull/161 is merged