feat[healthcheck]: new health endpoint

[luislhl]

Motivation

We are building a new healthcheck standard

Acceptance Criteria

• Create a /health endpoint that will check the health of the p2p sync and return our new health check format
• Allow changing the endpoint behavior regarding the status code it will return, by providing the strict_status_code query param in the request. It will make the endpoint return 200 even if there is a healthcheck failure.

TODO

• Generate the new Nginx image

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

The base branch was changed.

[codecov]

Codecov Report

Attention: 14 lines in your changes are missing coverage. Please review.

Comparison is base (4f2da10) 84.53% compared to head (7962d44) 84.48%.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #807      +/-   ##
==========================================
- Coverage   84.53%   84.48%   -0.05%     
==========================================
  Files         266      269       +3     
  Lines       22131    22223      +92     
  Branches     3380     3398      +18     
==========================================
+ Hits        18708    18775      +67     
- Misses       2757     2774      +17     
- Partials      666      674       +8     

Files	Coverage Δ
hathor/builder/resources_builder.py	94.44% <100.00%> (+0.05%)	⬆️
hathor/healthcheck/resources/__init__.py	100.00% <100.00%> (ø)
hathor/healthcheck/resources/healthcheck.py	100.00% <100.00%> (ø)
hathor/manager.py	80.95% <100.00%> (ø)
hathor/p2p/resources/healthcheck.py	68.75% <0.00%> (-31.25%)	⬇️
hathor/healthcheck/models.py	79.68% <79.68%> (ø)

... and 4 files with indirect coverage changes

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