Added extra functionality to FloatEdit

[vallsv]

Closes #3888

This PR mostly provides extra validators that i have designed during the years.

It allows configurable behaviours like:

• Empty input as None
• Fast edition of the dot . from the input
• Included/excluded float min/max boundaries
• Basic support for quantities
• Plus a bit more accurate value will is it not edited by the user

This PR also add some tests to the FloatEdit.

Changelog:

• Added support to custom validators to FloatEdit widget
• Added extra validators to share common behaviours

[vallsv]

Tested manually with pyside6-6.5.1.1, sounds like it's ok