Remove unnecessary attribute types from DSL

The diff shows the removal of several attribute type definitions, including symbol, date, time and datetime from the dsl.rb file. These attribute definitions were likely not needed or used, leading to unnecessary code that has now been cleaned up.

lib/datory/attributes/dsl.rb

@@ -40,11 +40,6 @@ def uuid(name, **options)
 
         ########################################################################
 
-        def symbol(name, **options)
-          options = options.merge(from: Symbol)
-          attribute(name, **options)
-        end
-
         def string(name, **options)
           options = options.merge(from: String)
           attribute(name, **options)
@@ -60,21 +55,6 @@ def float(name, **options)
           attribute(name, **options)
         end
 
-        def date(name, **options)
-          options = options.merge(from: Date)
-          attribute(name, **options)
-        end
-
-        def time(name, **options)
-          options = options.merge(from: Time)
-          attribute(name, **options)
-        end
-
-        def datetime(name, **options)
-          options = options.merge(from: DateTime)
-          attribute(name, **options)
-        end
-
         ########################################################################
 
         def collection_of_attributes