Improving Spring Boot support: Correctly interpret endpoints with multipart form data

[altro3]

Added support endpoints like these:

    @Post(value = "/file", consumes = MediaType.MULTIPART_FORM_DATA)
    // Query value, because for Spring Boot need to set annotation `@RequestParam` and it's mapped to `@QueryValue`
    // `json` parameter must be ignored, because it is map fo all query parameters, and we can't interpret it correct
    public void endpoint(@QueryValue Map<String, CompletedFileUpload> files, @QueryValue @Parameter(in = QUERY) Map<String, String> json) {
    }
    
    @Post(value = "/file", consumes = MediaType.MULTIPART_FORM_DATA)
    public void endpoint2(@QueryValue Map<String, CompletedFileUpload> files) {
    }

    @Post(value = "/fileWithJson", consumes = MediaType.MULTIPART_FORM_DATA)
    // Query value, because for Spring Boot need to set annotation `@RequestParam` and it's mapped to `@QueryValue`
    // in this case json will be interpreted as a part of multipart request 
    public void endpoint2(@QueryValue Map<String, CompletedFileUpload> files, @QueryValue Map<String, String> json) {
    }

    @Post(value = "/fileArray", consumes = MediaType.MULTIPART_FORM_DATA)
    public void endpoint3(CompletedFileUpload[] files) {
    }

    @Post(value = "/fileList", consumes = MediaType.MULTIPART_FORM_DATA)
    public void endpoint4(List<CompletedFileUpload> files) {
    }

    @Post(value = "/fileMapOfList", consumes = MediaType.MULTIPART_FORM_DATA)
    public void endpoint5(Map<String, List<CompletedFileUpload>> files) {
    }

[sdelamo]

@altro3 please, resolve the conflict and merge.