Add sample requests for all custom fields types for the com_content.article context

[alexandreelise]

Is your feature request related to a problem? Please describe.
Might be useful to see how every custom fields behave in regard to using them via api

Describe the solution you'd like
Adding all revelant endpoints that does it specifically for com_content.article context as it would be same for other contexts lett's focus on that one.

Describe alternatives you've considered
Using only text type custom field

Additional context
none