Refined: Treat fields with NonEmpty or MinSize(>0) as required

[kciesielski]

Fixes #3828

• Schemas for types with refined constrains MinSize, MaxSize and NonEmpty will now get proper non-custom validators, translated to minItems and maxItems properties in specs.
• Schemas for types validated with MinSize will now be marked as required (optional = false)

Example fields:

    nicknames: List[String Refined (MinSize[3] And MaxSize[6])] Refined NonEmpty,
    nicknames2: List[String Refined MinSize[4]] Refined (MaxSize[7] And MinSize[2]),
    nicknames3: List[String] Refined MaxSize[50]

Docs: