Resolve Antora resources IDs on images

[marieflorescontact]

this is WIP
I am not sure where to create the contentCatalog (I guess when the Antora support is activated?)

[ggrossetie]

Error: src/test/asciidoctorconfig.test.ts(55,108): error TS2345: Argument of type 'WebviewPanel' is not assignable to parameter of type 'WebviewResourceProvider'.
Type 'WebviewPanel' is missing the following properties from type 'WebviewResourceProvider': asWebviewUri, asMediaWebViewSrc, cspSource

src/test/asciidoctorconfig.test.ts is using the AsciidocParser so we need to update the call signature.

[marieflorescontact]

I use Sinon.JS as mock library to mock AntoraDocumentContext :

After many tries I didn't manage to test AsciidoctorWebViewConverter for an Antora ID.
ContentCatalog was always undefined and aggregateContent() sent me an error because the workspacefolder used while testing was not a git repository 😕