feat(blob): extend blob struct with index field

[vgonkivs]

What was done:

• added index to the blob struct;
• introduced a new parser entity that collects shares and transforms them to blob;
• added tests to compare shares received from share service by coordinates that have gotten from blob index;

[codecov-commenter]

Codecov Report

Attention: 51 lines in your changes are missing coverage. Please review.

Comparison is base (5e1895c) 51.81% compared to head (522e65c) 52.23%.
Report is 3 commits behind head on main.

Files	Patch %	Lines
blob/parser.go	69.56%	14 Missing and 7 partials ⚠️
blob/helper.go	54.54%	9 Missing and 6 partials ⚠️
blob/service.go	87.61%	11 Missing and 2 partials ⚠️
blob/blob.go	71.42%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3165      +/-   ##
==========================================
+ Coverage   51.81%   52.23%   +0.41%     
==========================================
  Files         178      179       +1     
  Lines       11286    11422     +136     
==========================================
+ Hits         5848     5966     +118     
- Misses       4930     4955      +25     
+ Partials      508      501       -7     

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[Wondertan]

We should mark this API and proto breaking

[walldiss]

We should mark this API and proto breaking

Looks like there are only new fields added, so it is backwards compatible.

[Wondertan]

Initial review of semantics

[Wondertan]

Looks like there are only new fields added, so it is backwards compatible.

I know, but that's not the point. We need to mark it so that eiger team can react to this PR and update rust client respectively

[Wondertan]

Another semantical review

[renaynay]

another general comment, the code inside retrieve is getting long/hairy and would benefit from some comments throughout.

[Wondertan]

Last little comments/questions. Looking slightly better

[Wondertan]

Please improve the PR description and add other secondary changes in this PR, like tracing

[jcstein]

• update examples for rpc docs

{
  "id": 1,
  "jsonrpc": "2.0",
  "result": [
    {
      "namespace": "AAAAAAAAAAAAAAAAAAAAAAAAAAECAwQFBgcICRA=",
      "data": "VGhpcyBpcyBhbiBleGFtcGxlIG9mIHNvbWUgYmxvYiBkYXRh",
      "share_version": 0,
      "commitment": "AD5EzbG0/EMvpw0p8NIjMVnoCP4Bv6K+V6gjmwdXUKU="
      "index": 1
    }
  ]
}

[jcstein]

• update the node-tutorial with new values once this is in a release on mainnet/mocha/arabica. task for @jcstein