fix(jans-config-api): creating attributes

[moabu]

When creating attributes, the backend will complain if the dataType has a value "STRING". Instead the value "string" must be provided to achieve the desired result. The API, however, lists the enums in capital letters. Ideally, the backend should do a toLower() on the value and always validate against lower case (or vice versa). The same applies for all other enums.

[pujavs]

Fixed code for case insensitive handling of Enum

Attribute:

[moabu]

Thank you . Any reference for the PR that fixed this ?

[pujavs]

PR 2854

[moabu]

Thank you ! Closing