Implement #135: Move linking to frontend

[SOF3]

Description

Related issues

See #135

Special notes for your reviewer:

[codecov-commenter]

Codecov Report

Patch coverage: 72.79% and project coverage change: +5.63% 🎉

Comparison is base (aa3bd12) 36.82% compared to head (cac7ecc) 42.45%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #157      +/-   ##
==========================================
+ Coverage   36.82%   42.45%   +5.63%     
==========================================
  Files          33       40       +7     
  Lines        2626     3380     +754     
==========================================
+ Hits          967     1435     +468     
- Misses       1596     1851     +255     
- Partials       63       94      +31     

Files Changed	Coverage Δ
pkg/frontend/backend/interface.go	26.66% <0.00%> (ø)
pkg/frontend/tf/config/config.go	10.00% <0.00%> (ø)
pkg/util/object/key.go	11.32% <ø> (+6.32%)	⬆️
pkg/util/reflect/reflect.go	83.33% <0.00%> (-16.67%)	⬇️
pkg/util/zconstants/zconstants.go	0.00% <0.00%> (ø)
pkg/frontend/tf/config/link_selector.go	14.28% <14.28%> (ø)
pkg/frontend/tf/tree/tree.go	48.22% <68.57%> (ø)
pkg/util/zconstants/link.go	76.19% <76.19%> (ø)
pkg/frontend/reader/merge/merge.go	81.81% <81.81%> (ø)
pkg/util/semaphore/semaphore.go	87.05% <85.71%> (-1.41%)	⬇️

... and 1 file with indirect coverage changes

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