Iceberg.Scaffolding

[david-acker]

Build a test scaffolding CLI tool, along with related analyzers and code fixes, which use Iceberg's dependency mapping functionality for the following:

1. Scaffolding integration tests for a specified entry point:
   • Map all upstream dependencies to their furthest extents
   • Use the provided settings and/or filtering logic for determining which dependencies should be mocked and which should use concrete implementations
   • Scaffold mocking code for these mocked dependencies
   • Setup the class containing the entry point for testing, handling dependency resolution and passing both mocks and concrete instances via constructor injection
2. Simplify maintenance of scaffolded integration tests:
   1. Analyzers:
      • ICE001: Missing mock for {dependency}
        • Report diagnostics for dependencies which are not mocked, but require them based on the associated settings/or filtering logic for the test
      • ICE002: Unused mock
        • Report diagnostics for mocks which are no longer required after changes are made to the entry point and/or it's dependencies
   2. Code Fixes:
      • Add mock setup statements based on ICE001
      • Remove unused mock setup statements based on ICE002