[FEATURE]: Add healthcheck

[shanduur]

Are you interested in contributing to the development of this feature?

Yes

Is your feature request related to a problem? Please describe.

A lot of repositories struggle with implementing health check. We can standardise it for COSI Drivers.

Describe the solution you'd like.

Write a proposal/proof of concept, that will implement the custom health check mechanism. The healthcheck should:

• define a Checker interface;
• Checker should have methods for:
  • checking if the connection to the Object Storage Provider (OSP) can be established (CanConnect() error ?);
  • checking if the driver can authenticate to the OSP (IsAuthenticated() error ?)
• start a http server that can be used by Kubernetes or docker to check the /healthz endpoint.

Describe alternatives you've considered.

N/A

Additional Information

• The desired library to use is hellofresh/health-go.