[REQ] Treat all found files as one file, preprocessing references if possible

Is your feature request related to a problem? Please describe.

I have, to keep my specs somewhat reasonable, split out several data types such as the enum into distinct files. When referencing these datatypes in the root yaml, I then ref "./enum-openapi.yaml#/components/schema/enumFoo".

My expectation is that, when using the glob import for source files, these references would be merged and treated as a single, effective file. Instead, types that are in OTHER files are not included in the export, and excessive types with a hundred pluss character names are created instead.

Describe the solution you'd like

A way to tell the generator to pre-process the openapi and treat it as one file if the reference exists in the fetched files.

Describe alternatives you've considered

I can theoretically manually pre-process using openapi-merge-cli, or I can merge the openapi-files back teogher by hand, but neither solution is ideal as that massivly increases the upkeep.

(If Im crazy and missing an option, Id love to know it, but I was unable to find an option that tells the generator to export everything)

Reproduce the case with the root YAML referencing ./enum-openapi.yaml#/components/schema/enumFoo while using glob import for the source files. Compare the current behavior with openapi-merge-cli and trace the generator's glob-import and reference-resolution entry points. Done means references found in fetched files are treated as one effective specification and exported without excessive generated type names.