chore: separate mempool infra test utils from test

[Itay-Tsabary-Starkware]

Stack:

• chore: cleanup and extend todo comments #216
• chore: separate mempool infra test utils from test #215 ⬅
• chore: move component client server test to tests dir #214
• chore: separate component definitions from component server #213

⚠️ Part of a stack created by spr. Do not merge manually using the UI - doing so may have unexpected results.

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This change is 

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 67.39%. Comparing base (4151c53) to head (d716b09).

Additional details and impacted files

@@                                        Coverage Diff                                         @@
##           pr/Itay-Tsabary-Starkware/tsabary/refactor_mempool_infra/866c1c00     #215   +/-   ##
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  Coverage                                                              67.39%   67.39%           
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  Files                                                                     25       25           
  Lines                                                                    917      917           
  Branches                                                                 917      917           
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  Hits                                                                     618      618           
  Misses                                                                   273      273           
  Partials                                                                  26       26           

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[Yael-Starkware]

Reviewed 2 of 2 files at r1, all commit messages.
Reviewable status: complete! all files reviewed, all discussions resolved (waiting on @Itay-Tsabary-Starkware)

[Itay-Tsabary-Starkware]

✓ Commit merged in pull request #216