New: Create a Metadata Extraction Cronjob

src/MetadataExtractorCron.sln

...adataExtractorCron/Extractors/CoscineMetadataExtractor.cs

src/MetadataExtractorCron/Extractors/IMetadataExtractor.cs

src/MetadataExtractorCron/MetadataExtractorCron.csproj

src/MetadataExtractorCron/Program.cs

src/MetadataExtractorCron/Util/GraphStorer.cs

src/MetadataExtractorCron/Util/HashUtil.cs

src/MetadataExtractorCron/Util/MetadataGraphsCreator.cs

src/MetadataExtractorCron/VersionUtil.cs

src/OpenApiGeneratedConnector/.gitignore

src/OpenApiGeneratedConnector/.openapi-generator-ignore

...penApiGeneratedConnector/OpenApiGeneratedConnector.csproj

src/OpenApiGeneratedConnector/README.md

src/OpenApiGeneratedConnector/appveyor.yml

src/OpenApiGeneratedConnector/docs/DefaultApi.md

src/OpenApiGeneratedConnector/docs/MetadataOutput.md

src/OpenApiGeneratedConnector/docs/ModelVersion.md

src/OpenApiGeneratedConnector/git_push.sh

...GeneratedConnector/src/Org.OpenAPITools/Api/DefaultApi.cs

...neratedConnector/src/Org.OpenAPITools/Client/ApiClient.cs