(poc): Experimenting with Swagger API generator

Signed-off-by: Patrik Gfeller <patrik.gfeller@proton.me>

bundles/org.openhab.binding.jellyfin/tools/swagger/config.json

@@ -0,0 +1,4 @@
+{
+    "groupId": "org.openhab.binding.jellyfin.internal.API.generated"
+
+}

bundles/org.openhab.binding.jellyfin/tools/swagger/generate.sh

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+#!/usr/bin/bash
+clear
+
+CLI=2.2.1
+
+VERSION=$(curl -sL https://repo.jellyfin.org/releases/openapi/jellyfin-openapi-stable.json | jq -r .info.version)
+
+echo "ℹ️  - Using latest Jellyfin API: ${VERSION}"
+
+FILENAME="./jellyfin-openapi-$VERSION.json"
+
+if [ ! -e "${FILENAME}" ]; then
+    echo "⏬ - Downloading latest OPENAPI definition for Version ${VERSION}..."
+    wget                            \
+        --no-verbose                \
+        --output-document=$FILENAME \
+        https://repo.jellyfin.org/releases/openapi/jellyfin-openapi-stable.json
+fi
+
+
+# http://nuc.ehrendingen:8096/api-docs/openapi.json
+# OPENAPI=openapi-jellyfin-10.10.3.json
+
+# library
+#     library template (sub-template) to use:
+#     jersey1 - HTTP client: Jersey client 1.18. JSON processing: Jackson 2.4.2
+#     jersey2 - HTTP client: Jersey client 2.6
+#     feign - HTTP client: Netflix Feign 8.1.1.  JSON processing: Jackson 2.6.3
+#     okhttp-gson (default) - HTTP client: OkHttp 2.4.0. JSON processing: Gson 2.3.1
+#     retrofit - HTTP client: OkHttp 2.4.0. JSON processing: Gson 2.3.1 (Retrofit 1.9.0)
+#     retrofit2 - HTTP client: OkHttp 2.5.0. JSON processing: Gson 2.4 (Retrofit 2.0.0-beta2)
+#     google-api-client - HTTP client: google-api-client 1.23.0. JSON processing: Jackson 2.8.9
+#     rest-assured - HTTP client: rest-assured : 3.1.0. JSON processing: Gson 2.6.1. Only for Java8
+
+# java -Xmx8G -jar swagger-codegen-cli-${CLI}.jar generate \ 
+#   -i $OPENAPI 
+#   -l java
+#   -c config.json
+#   -o ~Temp/jellyfin/api/$VERSION