bitswap/network: split Routing in two in interface

[Jorropo]

This change does nothing, the reason it exists is because two different branches want to independently remove methods from this interface, this decouple the two methods allowing to do so without git conflicts.

[Jorropo]

Current dependencies on/for this PR:

• main
  • PR bitswap/network: split Routing in two in interface #580 👈
    • PR Revert blockservice sessions context #578
      • PR Move providing responsabilities from bitswap to blockservice #534

This stack of pull requests is managed by Graphite.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (79cb4e2) 65.56% compared to head (911f4e9) 65.34%.

@@            Coverage Diff             @@
##             main     #580      +/-   ##
==========================================
- Coverage   65.56%   65.34%   -0.22%     
==========================================
  Files         207      204       -3     
  Lines       25597    25526      -71     
==========================================
- Hits        16782    16680     -102     
- Misses       7336     7362      +26     
- Partials     1479     1484       +5     

see 16 files with indirect coverage changes

[Jorropo]

Forget this, that doesn't help since then it has conflicts on the ipfs_impl.go implementation and theses can't be solved without a dependence (as there is a single argument for both codepaths).