ipld: move from DAGService to BlockService

[vgonkivs]

No description provided.

[adlerjohn]

no comments

[liamsi]

I think @Wondertan should have a final say here but this LGTM.

[Wondertan]

Very nice. Thank you.
Just a few prettifying nits.

Also, this PR does not fully solve the attached issue. It is just a first step.

[Wondertan]

Needs rebase to fix tests

[codecov-commenter]

Codecov Report

Merging #730 (aa82d55) into main (55b7b7e) will decrease coverage by 0.01%.
The diff coverage is 98.91%.

@@            Coverage Diff             @@
##             main     #730      +/-   ##
==========================================
- Coverage   52.77%   52.76%   -0.02%     
==========================================
  Files         116      116              
  Lines        6596     6603       +7     
==========================================
+ Hits         3481     3484       +3     
- Misses       2752     2755       +3     
- Partials      363      364       +1     

Impacted Files	Coverage Δ
header/header.go	46.77% <0.00%> (ø)
node/node.go	62.50% <ø> (ø)
header/core/exchange.go	50.00% <100.00%> (ø)
header/core/listener.go	58.49% <100.00%> (ø)
ipld/add.go	82.35% <100.00%> (ø)
ipld/get.go	77.14% <100.00%> (ø)
ipld/get_shares.go	73.46% <100.00%> (ø)
ipld/nmt_adder.go	63.33% <100.00%> (-3.34%)	⬇️
ipld/plugin/nmt.go	35.88% <100.00%> (+1.05%)	⬆️
ipld/retriever.go	90.10% <100.00%> (+0.45%)	⬆️
... and 13 more

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[renaynay]

lgtm with one comment