feat: Gas escalator middleware

[daniel-savu]

Description

Follow up to #3852 and #4098.

Since each escalator instance spawns a thread and we create transient providers for each message, this created a memory leak of escalator tasks that would build up over time - on RC, memory usage had reached 27gb before we noticed.

This PR merges in the changes from #4208 to stop the leak.

Memory profile before the fix (62mb peak usage):

Memory profile after the fix (16mb peak usage):

Drive-by changes

Related issues

Backward compatibility

Testing

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Latest commit: 68f90eb

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 74.60%. Comparing base (0754d62) to head (68f90eb).
Report is 2 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #4211      +/-   ##
==========================================
+ Coverage   74.58%   74.60%   +0.01%     
==========================================
  Files         103      103              
  Lines        1515     1516       +1     
  Branches      195      195              
==========================================
+ Hits         1130     1131       +1     
  Misses        364      364              
  Partials       21       21              

Components	Coverage Δ
core	84.61% <ø> (ø)
hooks	77.77% <ø> (ø)
isms	79.02% <ø> (ø)
token	89.07% <ø> (+0.06%)	⬆️
middlewares	77.58% <ø> (ø)