chore: refactor python healthcheck lib

[luislhl]

Motivation

Refactor the former healthcheck logic to use the new healthcheck lib we've built in https://github.com/HathorNetwork/python-healthcheck-lib

Acceptance Criteria

• The /health endpoint should keep working like described in feat[healthcheck]: new health endpoint #807

TODO

• The lib is being installed directly from the Git repo to make sure we can test it. But we should install it from PyPI when it's available there.

Checklist

• If you are requesting a merge into master, confirm this code is production-ready and can be included in future releases as soon as it gets merged

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (61327ba) 85.34% compared to head (be3539a) 85.29%.
Report is 1 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #826      +/-   ##
==========================================
- Coverage   85.34%   85.29%   -0.05%     
==========================================
  Files         283      282       -1     
  Lines       22331    22269      -62     
  Branches     3380     3365      -15     
==========================================
- Hits        19059    18995      -64     
- Misses       2597     2601       +4     
+ Partials      675      673       -2     

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