op-node: Add peer score diffs to increment and decay application scores

[ajsutton]

Description

Adds scoreDiff implementations to support incrementing and decaying application score elements.

Tests

Added unit tests.

Metadata

• https://linear.app/optimism/issue/CLI-3732/implement-p2p-req-resp-peer-scoring

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Latest commit: babe99b

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[codecov]

Codecov Report

Merging #6068 (babe99b) into develop (4dbbee2) will increase coverage by 0.04%.
The diff coverage is 100.00%.

Additional details and impacted files

@@             Coverage Diff             @@
##           develop    #6068      +/-   ##
===========================================
+ Coverage    44.70%   44.74%   +0.04%     
===========================================
  Files          298      298              
  Lines        22949    22965      +16     
===========================================
+ Hits         10259    10276      +17     
+ Misses       11742    11739       -3     
- Partials       948      950       +2     

Flag	Coverage Δ
bedrock-go-tests	44.74% <100.00%> (+0.04%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
op-node/p2p/store/iface.go	100.00% <100.00%> (ø)

... and 2 files with indirect coverage changes

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