Improvements to unique and exists rule and add isDirty method

Bug Fixes

• use correct property name for reading local primary key value (65790bf), closes #1069

Features

• add isDirty method (#1068) (151f862)
• add meta to all relations (#1042) (ade635f)
• add support for creating transaction client from model (4a2adcd)
• allow unique and exists validations to perform case insensitive search (761f823)

What's Changed

• feat: add meta to all relations by @zaosoula in #1042
• feat: add isDirty method by @adamcikado in #1068
• feat: unique accept options as object by @Xstoudi in #1012

New Contributors

• @zaosoula made their first contribution in #1042
• @Xstoudi made their first contribution in #1012

Full Changelog: v21.4.0...v21.5.0