Export validation annotations in openapi schema

[peschmae]

Describe the problem/challenge you have
Currently the openapi schema generated using ytt -f schema.yaml --data-values-schema-inspect --output openapi-v3 is missing any of the #@schema/validation rules.

Describe the solution you'd like
Exporting the openapi-v3 schema, should include the named rules since they all seem to be relatively easy to map to openapi-v3.

Type	ytt validation	openapi validation
string	min_len	minLength
string	max_len	maxLength
integer	min	minimum
integer	max.	maximum
any	not_null=(nullable)	nullable=true
any	one_of	enum

Only one_not_null seems to be a bit more complicate to map, and could be left out.

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[peschmae]

Just realized #@schema/nullable is converted to the corresponding attribute in openapi, but the not_null validation isn't.

Since the not_null validation, is documented mostly with additional lambda condition, this could also be left out.