Rudder

Currently in ncf, all parameters are string that should not be empty with no trailling/leading whitespace and are trimmed.

This prevent some usecases. like #8151

We will add a field as metadata in our generic methods like this:

@parameter_constraint <param_name> constraint_1 : value_1, constraint_2 : value_2

constraint will be defined as a simili json, so we can defined several at the same time.

Some constraint we want to define:

allow_empty_string
allow_whitespace_string
list of values
matching regexp
non matching regexp
minimal size
maximal size

This issue will have a pull request on the python API