Add support for Function and Trigger domain objects (#1060)

Vast commit, includes:

 * Introduces the Trigger domain entity.
 * Introduces the Fns domain entity.
 * V2 of the API for interacting with the new entities in swaggerv2.yml
 * Adds v2 end points for Apps to support PUT updates.
 * Rewrites the datastore level tests into a new pattern.
 * V2 routes use entity ID over name as the path parameter.

api/server/runner.go

@@ -21,13 +21,13 @@ import (
 func (s *Server) handleFunctionCall(c *gin.Context) {
 	err := s.handleFunctionCall2(c)
 	if err != nil {
-		handleErrorResponse(c, err)
+		handleV1ErrorResponse(c, err)
 	}
 }
 
 // handleFunctionCall2 executes the function and returns an error
 // Requires the following in the context:
-// * "app_name"
+// * "app"
 // * "path"
 func (s *Server) handleFunctionCall2(c *gin.Context) error {
 	ctx := c.Request.Context()
@@ -81,7 +81,7 @@ func (s *Server) serve(c *gin.Context, app *models.App, path string) error {
 		return err
 	}
 	model := call.Model()
-	{ // scope this, to disallow ctx use outside of this scope. add id for handleErrorResponse logger
+	{ // scope this, to disallow ctx use outside of this scope. add id for handleV1ErrorResponse logger
 		ctx, _ := common.LoggerWithFields(c.Request.Context(), logrus.Fields{"id": model.ID})
 		c.Request = c.Request.WithContext(ctx)
 	}