refactor: to/from json, traits for cid

[zeeshanlakhani]

No description provided.

[codecov]

Codecov Report

Merging #142 (b0ee54c) into main (a4246a8) will decrease coverage by 0.08%.
The diff coverage is 53.57%.

@@            Coverage Diff             @@
##             main     #142      +/-   ##
==========================================
- Coverage   48.99%   48.92%   -0.08%     
==========================================
  Files          46       49       +3     
  Lines        2092     2087       -5     
  Branches      521      515       -6     
==========================================
- Hits         1025     1021       -4     
- Misses        745      750       +5     
+ Partials      322      316       -6     

Impacted Files	Coverage Δ
homestar-core/src/ipld/link.rs	0.00% <0.00%> (ø)
homestar-core/src/lib.rs	100.00% <ø> (ø)
homestar-core/src/unit.rs	20.00% <ø> (ø)
homestar-core/src/workflow.rs	69.56% <ø> (+0.81%)	⬆️
homestar-core/src/workflow/ability.rs	80.00% <ø> (ø)
homestar-core/src/workflow/input.rs	51.04% <ø> (ø)
homestar-core/src/workflow/instruction.rs	56.14% <0.00%> (-1.93%)	⬇️
homestar-core/src/workflow/issuer.rs	0.00% <ø> (ø)
homestar-core/src/workflow/pointer.rs	59.67% <ø> (ø)
homestar-core/src/workflow/prf.rs	53.84% <ø> (ø)
... and 14 more