fix(routing/http/server): adjust bucket sizes for http metrics

[2color]

This PR addresses feedback from ipfs/someguy#87 (review) and introduced more realistic size buckets for the response size histogram.

Reference numbers

• https://delegated-ipfs.dev/routing/v1/providers/bafkreibm6jg3ux5qumhcn2b3flc3tyu6dmlb4xa7u5bf44yegnrjhc4yeq 179331 bytes
• Current metrics (not segmented per route)
  

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 60.33%. Comparing base (13d0b32) to head (55f0233).
Report is 6 commits behind head on main.

@@            Coverage Diff             @@
##             main     #724      +/-   ##
==========================================
- Coverage   60.35%   60.33%   -0.02%     
==========================================
  Files         243      243              
  Lines       31057    31057              
==========================================
- Hits        18744    18738       -6     
- Misses      10643    10650       +7     
+ Partials     1670     1669       -1     

Files with missing lines	Coverage Δ
routing/http/server/server.go	74.30% <100.00%> (ø)

... and 7 files with indirect coverage changes

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