refactor!(share): integrate new Namespace type

[Wondertan]

Notable Changes

• namespace.ID to share.Namespace
  • Changes every comment namespace ID mentioning to just namespace. I renamed every such mention besides in ADRs. I don't want to touch ADRs here, as they need a more holistic re-review and up-to-date catchup.
  • Uses all the utility methods on the type, where suitable
• Namespace constructor now only creates Blob Namespaces. For other reserved namespaces, the predefined globals should be used.
• Uses namespace.ValidateDataNamespace everywhere data is requested. This is guarantees we verify the namespace are 100% valid and forbids requesting parity and padding namespaces.
• Restricts PFBs for reserved namespaces
• Reversed the dependency from share -> share/ipld to share/ipld -> share
• NewBlobV0 constructor. Similar to NewNamespaceV0
• sharetest pkg for share related testing utilities
• edstest pkg for eds related testing utilities

Follow-ups

• blobtest pkg to generate node's blob type

Refs

• Substitutes zombie PR refactor!(share): integrate new Namespace type #2376. I push to the branch, but GH does not see commits.
• Based on share: introduce Namespace type #2367
• Closes Rename nID to namespace where applicable #2301
• Closes share: unify and move share.MaxSquareSize and ipld.MaxSquareSize to share/eds #2309
• Blocked on feat(share/getter) Add support for Non-inclusion proofs  #2256

[codecov-commenter]

Codecov Report

Merging #2388 (07c3ec8) into main (0267e21) will increase coverage by 2.38%.
The diff coverage is 41.76%.

@@            Coverage Diff             @@
##             main    #2388      +/-   ##
==========================================
+ Coverage   50.68%   53.07%   +2.38%     
==========================================
  Files         157      156       -1     
  Lines        9935     9915      -20     
==========================================
+ Hits         5036     5262     +226     
+ Misses       4456     4199     -257     
- Partials      443      454      +11     

Impacted Files	Coverage Δ
api/gateway/endpoints.go	0.00% <0.00%> (ø)
api/gateway/share.go	7.69% <0.00%> (ø)
header/headertest/testing.go	72.48% <0.00%> (+0.55%)	⬆️
nodebuilder/share/constructors.go	12.76% <0.00%> (-0.88%)	⬇️
nodebuilder/share/module.go	0.00% <ø> (ø)
nodebuilder/share/share.go	0.00% <ø> (ø)
share/empty.go	0.00% <0.00%> (-55.56%)	⬇️
share/getter.go	0.00% <0.00%> (ø)
share/getters/cascade.go	78.08% <0.00%> (ø)
share/getters/tee.go	37.50% <0.00%> (ø)
... and 25 more

... and 4 files with indirect coverage changes

[Wondertan]

Now the PR is properly rebased

[walldiss]

Gigantic work, thank you for this!

1. Not sure how this test is passing, when it is clearly broken. Pls take a look:
   share/availability/light/availability_test.go:162

randNID := root.RowRoots[(len(root.RowRoots)-1)/2][:8]

2. There are few places that depend on appconsts.NamespaceSize, that could use on share.NamespaceSize instead.

[Wondertan]

Thank you for the great review @walldiss!

[Wondertan]

Rebased on main to resolve a conflict

[Wondertan]

Rebased on main

[renaynay]

finally