Healthcheck endpoint

[MatthewZMSU]

Description

Sometimes we need to check if the server is up.
This endpoint was made for this purpose.

Type of change

• New feature (non-breaking change which adds functionality)
• This change requires a documentation update

How Has This Been Tested?

I have tested it with several local spiders to ensure that nothing happened with other code. Also I have tested the endpoint with curl localhost:3000/health_check, and it has given the desired respons.

Checklist:

• My code follows the style guidelines of this project
• I have performed a self-review of my code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• My changes generate no new warnings