feat(schema.go): add 'deprecated' field to JSONMeta struct to indicat…

…e if the schema is deprecated

The 'deprecated' field is added to the JSONMeta struct to provide
information about whether the schema is deprecated or not. This field
will be used to indicate if the schema should no longer be used and
developers should migrate to a newer version or alternative.

schema/schema.go

@@ -37,6 +37,7 @@ type JSONMeta struct {
 	Comments            []string        `json:"comments"`
 	Definition          *JSONDefintion  `json:"definition"`
 	Version             string          `json:"version"`
+	Deprecated          bool            `json:"deprecated"`
 	Xrefs               []struct {
 		Val string `json:"val"`
 	} `json:"xrefs"`