[Chapel Merge] IFC: Add a writeup on the implementation of Interf

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Branch: refs/heads/master
Revision: 37b7e39
Author: vasslitvinov
Log Message:

Merge pull request #17705 from vasslitvinov/ifc-writeup

IFC: Add a writeup on the implementation of Interfaces

This adds a summary of the current implementation of
interfaces aka constrained generics (CG).

Modified Files:
A doc/rst/developer/implementation/Interfaces.md

Compare: https://github.com/chapel-lang/chapel/compare/92e1c8d4bef5...37b7e3936bb4