add setting and getting config in json format

[ayyhimself]

changes
/config get displays the object in json format
/config set displays the object in json format and accepts json format
removed old way of displaying objects
gson registered as a bean
very amazing pr

[danthe1st]

I have yet to test this but here's my initial review.

[danthe1st]

The PR looks mostly good but I noticed some issues while testing.

[danthe1st]

The changes look good to me and testing (including with native-image) seems like this mostly works.

However, I noticed one small regression due to how you removed the property parsers: When I try to set a string, it requires a double quotes around it. This breaks things like /config set property:moderationConfig.banMessageText value:Hello 123. I added a suggestion of how that could probably be fixed but that doesn't mean you have to do it that way.

[danthe1st]

Looks good to me.