use buildSpecification surcharge to avoid inconsitencies

[yelhouti]

Overview of the feature request

We have now buildStringSpecification and buildRangeSpecification that do not use function overloads with singleAttribute (only with with RootFunction) making it error prone. I recommend always calling buildSpecification letting the compiler detect the correct function at compile time.
jhipster/jhipster-bom#1804

Motivation for or Use Case

The current behavior is error prone specially when we change filter type or with TextBlob for examples.

• Checking this box is mandatory (this is just to show you read everything)