feature: Extend data types dynamically

[ezelsu]

Feature Request

Describe the Feature Request
Right now, only data types that are explicitly defined in extendibleDataTypes (environment.ts) are extended in the user interface. If all of the data types are extended in the beginning, infinite loops happen due to recursive definitions. Instead of this, data types should be extended dynamically when selected.

Is your feature request related to a problem? Please describe
Extendible data types require explicit definition instead of an automated way.

[ezelsu]

for example: Period