Revert blockservice sessions context

[Jorropo]

This brings us to a state before #549 back then I also did cleanup in this session code, that I have kept, I only removed the sessions in context feature.

[Jorropo]

• Remove provider query manager #536
• Remove content routing from bitswap network #535
• Move providing responsabilities from bitswap to blockservice #534
• Revert blockservice sessions context #578 👈 (View in Graphite)
• main

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 65.56%. Comparing base (8924807) to head (66da324).
⚠️ Report is 638 commits behind head on main.

@@            Coverage Diff             @@
##             main     #578      +/-   ##
==========================================
- Coverage   65.59%   65.56%   -0.04%     
==========================================
  Files         207      207              
  Lines       25612    25579      -33     
==========================================
- Hits        16801    16771      -30     
+ Misses       7338     7336       -2     
+ Partials     1473     1472       -1     

Files with missing lines	Coverage Δ
blockservice/blockservice.go	77.18% <ø> (-1.05%)	⬇️
gateway/blocks_backend.go	42.23% <ø> (+0.13%)	⬆️

... and 16 files with indirect coverage changes

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