New link structs from raw

[steiler]

the new link struct was just the first step.
Here we're continuing the refactoring.

[steiler]

@hellt alright, so to me this looks good

[codecov]

Codecov Report

Merging #1475 (9aa124c) into main (ba86eca) will increase coverage by 0.14%.
The diff coverage is 28.31%.

@@            Coverage Diff             @@
##             main    #1475      +/-   ##
==========================================
+ Coverage   20.25%   20.40%   +0.14%     
==========================================
  Files          71       79       +8     
  Lines        7634     8269     +635     
==========================================
+ Hits         1546     1687     +141     
- Misses       5952     6443     +491     
- Partials      136      139       +3     

Files Changed	Coverage Δ
clab/config/utils.go	44.84% <ø> (+2.40%)	⬆️
clab/graph.go	0.00% <0.00%> (ø)
cmd/deploy.go	6.61% <0.00%> (-0.12%)	⬇️
cmd/destroy.go	7.28% <0.00%> (-0.58%)	⬇️
cmd/exec.go	6.09% <0.00%> (-0.32%)	⬇️
cmd/generate.go	30.76% <0.00%> (-0.57%)	⬇️
cmd/graph.go	16.66% <0.00%> (-1.32%)	⬇️
cmd/save.go	8.88% <0.00%> (-0.87%)	⬇️
cmd/tools_veth.go	6.89% <0.00%> (-0.66%)	⬇️
links/endpoint_bridge.go	0.00% <0.00%> (ø)
... and 19 more