Introduce debug memory monitoring

[mpass99]

that alerts and prints additional debug information in case Poseidon exceeds 1 GB of memory usage.

Related to #453

[MrSerth]

I am fine to add such a debug statement and hope that the memory increase is "slow enough" to trigger it.

[codecov]

Codecov Report

Merging #457 (4ea328f) into main (c83bdbf) will increase coverage by 7.89%.
The diff coverage is 53.57%.

@@            Coverage Diff             @@
##             main     #457      +/-   ##
==========================================
+ Coverage   67.88%   75.78%   +7.89%     
==========================================
  Files          37       39       +2     
  Lines        3407     3642     +235     
==========================================
+ Hits         2313     2760     +447     
+ Misses        949      712     -237     
- Partials      145      170      +25     

Files Changed	Coverage Δ
cmd/poseidon/main.go	61.22% <53.57%> (+30.27%)	⬆️

... and 19 files with indirect coverage changes

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[sentry-io]

Suspect Issues

This pull request was deployed and Sentry observed the following issues:

• ‼️ Memory Threshold exceeded `` View Issue

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