Implement Decorator functionality

[mspaulik]

Try out usage of different decorators:

• deprecated
• doc - attach a documentation string. Works great with multiline string literals.
• summary - attach a documentation string. Typically a short single line description.
• format - specify the data format hint for a string type.
• pattern
• knownValues - make a string type with an enum that contains all known values.
• secret - make a string as a secret value that should be treated carefully to avoid exposure.
• minLength/maxLength
• minValue/maxValue

[mspaulik]

DONE: minLength/maxLength minValue/maxValue doc - attach a documentation string. Works great with multiline string literals. summary - attach a documentation string. Typically a short single line description. deprecated pattern secret - make a string as a secret value that should be treated carefully to avoid exposure. format - specify the data format hint for a string type. (done on andImplementation branch) knownValues - make a string type with an enum that contains all known values. Custom decorators