Add ISO string Date support

[slax57]

Description

Add ISO string Date support

For example:

{"posts": [
   {
       "id": "test",
       "postTime": "2022-01-01T00:00:00Z"
   }
]}

Supersedes #138

Related Issue

Fixes #136

ToDo

• Detect type as Date
• Handle ISO string date correctly in custom DateType
• Add list of supported types in doc
• Rebase onto Fix usage examples in Readme, closed issues link in Contributing, prettier config and version #138