chore: debugger's badgerdb cache optimisations

[atzoum]

Description

• Using multiple versions of the same key instead of a single version of each key containing multiple values (less cpu, i/o & memory intensive)
• Getting rid of mutexes (non-blocking between competing goroutines, e.g. router or gateway workers operating on the same keys)
• Delete previous values after reading them from cache

Notion Ticket

Link

Security

• The code changed/added as part of this pull request won't create any security issues with how the software is being used.

[codecov]

Codecov Report

Base: 52.85% // Head: 52.85% // Increases project coverage by +0.00% 🎉

Coverage data is based on head (d1af6fd) compared to base (a1c4ab8).
Patch coverage: 97.56% of modified lines in pull request are covered.

Additional details and impacted files

@@              Coverage Diff               @@
##           release/1.6.x    #3042   +/-   ##
==============================================
  Coverage          52.85%   52.85%           
==============================================
  Files                338      338           
  Lines              52136    52120   -16     
==============================================
- Hits               27555    27547    -8     
+ Misses             22972    22966    -6     
+ Partials            1609     1607    -2     

Impacted Files	Coverage Δ
services/debugger/cache/internal/badger/badger.go	76.99% <97.56%> (+3.34%)	⬆️

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