feat: add support for specifying resourceGroup in both cli and yaml (#189)

when a name is specified in cli or yaml, serverless will use this name to create the resourceGroup instead of creating a name from convention.

all underlying resources will still be created with a convention name.

Author: mydiemho

.editorconfig

@@ -0,0 +1,9 @@
+root = true
+
+[*]
+indent_style = space
+indent_size = 2
+charset = utf-8
+end_of_line = lf
+insert_final_newline = true
+trim_trailing_whitespace = true