Add concrete iter for InstancePorts and DInstancePorts

[MatthewMckee4]

Summary by Sourcery

New Features:

• Iterate over InstancePorts and DInstancePorts using iter and return Port and Dport objects respectively.

[sourcery-ai]

Reviewer's Guide by Sourcery

This pull request adds the iter method to the InstancePorts and DInstancePorts classes, enabling iteration over their ports. It also adds a test case for the new functionality.

Class diagram showing the changes to InstancePorts hierarchy

classDiagram
    class ProtoTInstancePorts {
      <<abstract>>
      +__getitem__()
      +cell_ports()* TUnit
      +each_port() Iterator[ProtoPort[TUnit]]
      +__iter__()* Iterator[ProtoPort[TUnit]]
      +each_by_array_coord()
    }

    class InstancePorts {
      +__getitem__() Port
      +__iter__() Iterator[Port]
    }

    class DInstancePorts {
      +__getitem__() DPort
      +__iter__() Iterator[DPort]
    }

    ProtoTInstancePorts <|-- InstancePorts
    ProtoTInstancePorts <|-- DInstancePorts

    note for ProtoTInstancePorts "each_port() renamed from __iter__()"
    note for InstancePorts "New concrete __iter__() implementation"
    note for DInstancePorts "New concrete __iter__() implementation"

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File-Level Changes

Change	Details	Files
Added the __iter__ method to InstancePorts and DInstancePorts.	Added an abstract __iter__ method to ProtoTInstancePorts. Implemented the __iter__ method in InstancePorts to iterate over Port objects. Implemented the __iter__ method in DInstancePorts to iterate over DPort objects. The __iter__ methods use the each_port method to get the base ports and then convert them to the correct type.	src/kfactory/instance_ports.py
Added a test case for the __iter__ method.	Added a test case test_iter to verify the functionality of the __iter__ method for both InstancePorts and DInstancePorts. The test case asserts that the correct number of ports are returned and that they are of the correct type.	tests/test_instance_ports.py

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 66.03%. Comparing base (7f2f976) to head (8dfad82).
Report is 3 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #597      +/-   ##
==========================================
+ Coverage   65.98%   66.03%   +0.05%     
==========================================
  Files          64       64              
  Lines        9504     9508       +4     
  Branches     1771     1771              
==========================================
+ Hits         6271     6279       +8     
+ Misses       2714     2713       -1     
+ Partials      519      516       -3     

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