Fix/fhir connection error handling

[mechanik-daniel]

This pull request introduces improvements and bug fixes related to FHIR server switching and client resolution in the Fumifier engine. The main changes include enhanced error handling and reporting for FHIR server connections, improved client management, and updates to type definitions for better clarity and interoperability. Additionally, dependencies have been updated for compatibility.

FHIR Server Switching and Client Resolution:

• The $useFhirServer function now throws a specific error (D3200) if a target is provided without a configured connection resolver, and wraps resolver failures in a new error (D3201) with detailed messages. This improves clarity and debuggability when switching FHIR servers. [1] [2] [3] [4]
• The resolved FHIR client is now stored and reused for subsequent FHIR operations, ensuring consistent behavior after switching servers. [1] [2]

Type Definition and Documentation Updates:

• All references to FhirStructureNavigator have been updated to FhirStructureNavigatorInterface in JSDoc typedefs and function signatures for improved type accuracy and compatibility. [1] [2] [3] [4] [5]

Dependency Updates:

• Updated @outburn/structure-navigator dependency from ^1.9.4 to ^1.9.5 in both devDependencies and peerDependencies for compatibility. [1] [2]
• Bumped package version from 2.2.0 to 2.2.1.