Qt OpenAPI server generator support (QHttpServer)

The OpenAPI Generator project generates HTTP client and server code from an OpenAPI specification. To generate the code, the generator uses generators that produce code for specific languages. The client and server-side generators are separate implementations.

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This epic is about adding a server-side generator which is capable of producing QHttpServer code. It is important to understand from the get-go that the support will at least initially not be the complete OpenAPI specification; the QHttpServer is feature-wise still in active development.

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For clarity it should be mentioned that currently a Qt-specific server-side generator (cpp-qt-qhttpengine-server) exists. It is based on a community library qhttpengine. The work done for this Epic likely has nothing to do with that.

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