feat: Implement GetSpecSchema plugin gRPC call (#130)

Closes cloudquery/cloudquery#16505

Author: candiduslynx

cloudquery/sdk/internal/servers/plugin_v3/plugin.py

@@ -28,6 +28,9 @@ def GetName(self, request, context):
     def GetVersion(self, request, context):
         return plugin_pb2.GetVersion.Response(version=self._plugin.version())
 
+    def GetSpecSchema(self, request, context):
+        return plugin_pb2.GetSpecSchema.Response(json_schema=self._plugin.json_schema())
+
     def Init(self, request: plugin_pb2.Init.Request, context):
         self._plugin.init(request.spec, no_connection=request.no_connection)
         return plugin_pb2.Init.Response()

cloudquery/sdk/plugin/plugin.py

@@ -41,6 +41,7 @@ class Options:
     build_targets: List[BuildTarget] = None
     team: str = None
     kind: str = None
+    json_schema: str = None
 
 
 class Plugin:
@@ -74,6 +75,9 @@ def team(self) -> str:
     def kind(self) -> str:
         return self._opts.kind
 
+    def json_schema(self) -> str:
+        return self._opts.json_schema
+
     def dockerfile(self) -> str:
         return self._opts.dockerfile