feat: validation service

[aljo242]

Spins up and internal validation service that can introspect the live prices the sidecar is producing.

If any of the prices is below our configured liveness threshold (99%, perhaps this should be stricter), the process will terminate itself.

If all prices are valid after a configured amount of time, the process will gracefully tear down and end sucessfully.

[aljo242]

moved to a common folder so it could be used by other code

[github-actions]

@check-spelling-bot Report

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Unrecognized words (1)

libhttp

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curl -s -S -L 'https://raw.githubusercontent.com/check-spelling/check-spelling/prerelease/apply.pl' |
perl - 'https://github.com/skip-mev/connect/actions/runs/10706806834/attempts/1'

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Available 📚 dictionaries could cover words (expected and unrecognized) not in the 📘 dictionary

This includes both expected items (755) from .github/actions/spelling/expect.txt and unrecognized words (1)

Dictionary	Entries	Covers	Uniquely
cspell:python/src/python/python-lib.txt	2417	8	4
cspell:fullstack/dict/fullstack.txt	419	5	4
cspell:java/src/java.txt	2464	5	3
cspell:filetypes/filetypes.txt	264	4	3
cspell:java/src/java-terms.txt	920	4	1

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          cspell:python/src/python/python-lib.txt
          cspell:fullstack/dict/fullstack.txt
          cspell:java/src/java.txt
          cspell:filetypes/filetypes.txt
          cspell:java/src/java-terms.txt

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check_extra_dictionaries: ''

Warnings (1)

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⚠️ Warnings	Count
⚠️ no-newline-at-eof	3

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[codecov]

Codecov Report

Attention: Patch coverage is 12.06897% with 102 lines in your changes missing coverage. Please review.

Project coverage is 55.52%. Comparing base (fc4879a) to head (bf62b8b).
Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
service/validation/validation.go	17.14%	58 Missing ⚠️
cmd/connect/main.go	0.00%	25 Missing ⚠️
oracle/metrics/metrics.go	0.00%	12 Missing ⚠️
pkg/http/address.go	0.00%	7 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #724      +/-   ##
==========================================
- Coverage   55.97%   55.52%   -0.45%     
==========================================
  Files         206      208       +2     
  Lines       11475    11582     +107     
==========================================
+ Hits         6423     6431       +8     
- Misses       4452     4552     +100     
+ Partials      600      599       -1     

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[aljo242]

removed the dead feeds. Validation fails when they are here and passing when they are gone

[Eric-Warehime]

It's not clear to me what the units are for this int--hours minutes days etc.

[technicallyty]

should this be commented out? comment suggests so

[technicallyty]

should we add a test for this logic?