add an instance check for overlaps

[sebastian-goeldi]

Summary

Adds a connectivity like check for overlapping instances on some layers

Test Plan

import gdsfactory as gf

gf.gpdk.PDK.activate()


@gf.cell
def pads() -> gf.Component:
    c = gf.Component()

    p1 = c << gf.get_component("pad")
    p2 = c << gf.get_component("pad")

    p1.movey(-250)
    p2.movey(250)

    gf.routing.route_bundle(
        c,
        [p1.ports["e2"]],
        [p2.ports["e4"]],
        layer=gf.get_layer("M3"),
        route_width=1,
    )

    return c


c = gf.Component("Overlap1")
i1 = c << pads()
i2 = c << pads()
i2.movex(100)

c2 = gf.Component("Overlap2")
c_i1 = c2 << c
c_i2 = c2 << c

c_i2.rotate(90)

db = gf.kf.utils.check_instance_touching(
    c2, layers=[gf.kcl.get_info(gf.get_layer("M3"))], recursive=True
)
print(db.num_items())
gf.kf.show(c2, lyrdb=db)

[codecov]

Codecov Report

❌ Patch coverage is 14.89362% with 40 lines in your changes missing coverage. Please review.
✅ Project coverage is 65.69%. Comparing base (bed97b3) to head (805bf31).

Files with missing lines	Patch %	Lines
src/kfactory/utils/check.py	13.04%	40 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #862      +/-   ##
==========================================
- Coverage   65.87%   65.69%   -0.19%     
==========================================
  Files          71       72       +1     
  Lines       13434    13481      +47     
  Branches     2595     2605      +10     
==========================================
+ Hits         8850     8856       +6     
- Misses       3769     3811      +42     
+ Partials      815      814       -1     

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