bitswap/server: allow overriding peer ledger with WithPeerLedger

[hacdias]

Introduces WithPeerLedger, which allows to override the default peer ledger with anything else you want.

[codecov[bot]]

Codecov Report

Attention: Patch coverage is 63.33333% with 11 lines in your changes are missing coverage. Please review.

Project coverage is 59.69%. Comparing base (eeea414) to head (8d74823).

@@            Coverage Diff             @@
##             main     #607      +/-   ##
==========================================
- Coverage   59.88%   59.69%   -0.20%     
==========================================
  Files         238      238              
  Lines       29868    29883      +15     
==========================================
- Hits        17887    17839      -48     
- Misses      10375    10425      +50     
- Partials     1606     1619      +13     

Files	Coverage Δ
bitswap/server/internal/decision/peer_ledger.go	94.17% <100.00%> (-1.79%)	:arrow_down:
bitswap/options.go	38.09% <0.00%> (-1.91%)	:arrow_down:
bitswap/server/internal/decision/engine.go	91.22% <20.00%> (-0.68%)	:arrow_down:
bitswap/server/server.go	64.63% <0.00%> (-2.43%)	:arrow_down:

... and 16 files with indirect coverage changes

[hacdias]

@lidel I refactored to only have one new option (WithPeerLedger). I did not add a no-op peer ledger here. I will do this in Rainbow. My idea is that I didn't want to export custom peer ledgers here. We also do not export the default peer ledger, just like it has been done with the score ledger. Just trying to avoid inconsistencies here. If we want to use the no-op peer ledger in other places, we can then bring it to Boxo.