feat: add sign pstb in sats-connect

[tomiir]

Description

• Adds signPSBT to SatsConnectConnector

Type of change

• [ ] Chore (non-breaking change that addresses non-functional tasks, maintenance, or code quality improvements)
• [ ] Bug fix (non-breaking change which fixes an issue)
• [x] New feature (non-breaking change which adds functionality)
• [ ] Breaking change (fix or feature that would cause existing functionality to not work as expected)

Checklist

• [ ] Code in this PR is covered by automated tests (Unit tests, E2E tests)
• [x] My changes generate no new warnings
• [x] I have reviewed my own code
• [x] I have filled out all required sections
• [x] I have tested my changes on the preview link
• [ ] Approver of this PR confirms that the changes are tested on the preview link

[changeset-bot[bot]]

⚠️ No Changeset found

Latest commit: 356e06dda5154bec9ed2a8a0be0bfc86555decee

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