[BUG] config.items and config.get do not properly handle fields with datetime values

[erwindon]

Description function config.items internally returns datetime objects that are not properly handled by outputters and/or salt-api.

Setup just a master and a minion.

• [ ] on-prem machine
• [X] VM (Virtualbox)
• [ ] VM running on a cloud service, please be explicit and add details
• [ ] container (Kubernetes, Docker, containerd, etc. please specify)
• [ ] or a combination, please be explicit
• [ ] jails if it is FreeBSD
• [ ] classic packaging
• [ ] onedir packaging
• [ ] used bootstrap to install

Steps to Reproduce the behavior Issue command config.get schedule also for config.items, but that one has much more unrelated output

Expected behavior time-related fields are properly reported. notably fields: schedule.__mine_interval._next_fire_time, schedule.__mine_interval._next_scheduled_fire_time and schedule.__mine_interval._last_run

observed behaviour:

• with salt --out json the fields are reported as strings, e.g. datetime.datetime(2022, 9, 17, 16, 20, 9, 840987)
• with salt --out yaml the fields are reported as strings, e.g. 2022-09-17 15:04:42.239934
• with salt --out nested (which is also the default) the fields are reported as empty values
• with salt-api the server crashes on the handling of this api call and only a "500 internal error" is reported this is of course the most important observation, as it makes config.items completely unusable in this context.

Versions Report

salt --versions-report

(Provided by running salt --versions-report. Please also mention any differences in master/minion versions.)

Salt Version:
          Salt: 3004.2
 
Dependency Versions:
          cffi: Not Installed
      cherrypy: unknown
      dateutil: 2.8.1
     docker-py: Not Installed
         gitdb: Not Installed
     gitpython: Not Installed
        Jinja2: 2.11.3
       libgit2: Not Installed
      M2Crypto: Not Installed
          Mako: Not Installed
       msgpack: 1.0.0
  msgpack-pure: Not Installed
  mysql-python: Not Installed
     pycparser: Not Installed
      pycrypto: Not Installed
  pycryptodome: 3.9.7
        pygit2: Not Installed
        Python: 3.9.2 (default, Feb 28 2021, 17:03:44)
  python-gnupg: Not Installed
        PyYAML: 5.3.1
         PyZMQ: 20.0.0
         smmap: Not Installed
       timelib: Not Installed
       Tornado: 4.5.3
           ZMQ: 4.3.4
 
System Versions:
          dist: debian 11 bullseye
        locale: utf-8
       machine: x86_64
       release: 5.10.0-15-amd64
        system: Linux
       version: Debian GNU/Linux 11 bullseye

Additional there might be other apis that have a similar behaviour