Allow widget users to pass their own 1193 provider+signer

[mpetrunic]

Implementation details

Instead of widget handling connecting wallets via connect button. We should allow widget users to pass in already connected wallet provider.
https://github.com/sygmaprotocol/sygma-widget/blob/01901e67f2a1d28341878f0188a108ab1906e47b/packages/widget/src/widget.ts#L44C31-L44C42

Testing details

Acceptance Criteria