refactor: Break core package into multiple packages under config/endpoint

[TwiN]

Summary

Breaks the core package into multiple packages under config/endpoint

Checklist

• Tested and/or added tests to validate that the changes work as intended, if applicable.
• Updated documentation in README.md, if applicable.

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 85.45455% with 64 lines in your changes are missing coverage. Please review.

Project coverage is 80.56%. Comparing base (4397dcb) to head (c36653e).

Files	Patch %	Lines
config/endpoint/endpoint.go	78.63%	14 Missing and 11 partials ⚠️
storage/store/sql/sql.go	80.85%	8 Missing and 1 partial ⚠️
config/config.go	56.25%	6 Missing and 1 partial ⚠️
alerting/provider/awsses/awsses.go	62.50%	3 Missing ⚠️
alerting/provider/email/email.go	62.50%	3 Missing ⚠️
storage/store/memory/memory.go	84.21%	0 Missing and 3 partials ⚠️
alerting/provider/gotify/gotify.go	66.66%	2 Missing ⚠️
alerting/provider/ntfy/ntfy.go	50.00%	2 Missing ⚠️
alerting/provider/twilio/twilio.go	60.00%	2 Missing ⚠️
api/endpoint_status.go	33.33%	2 Missing ⚠️
... and 5 more

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Additional details and impacted files

@@            Coverage Diff             @@
##           master     #759      +/-   ##
==========================================
- Coverage   80.64%   80.56%   -0.09%     
==========================================
  Files          64       64              
  Lines        4246     4249       +3     
==========================================
- Hits         3424     3423       -1     
- Misses        624      627       +3     
- Partials      198      199       +1     

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