Need base Path for health-checks

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

Hi I am currently deploying Cubejs behing Nginx Proxy so I should add prefix path to the Node.
As the basePath configuration works very well for `/v1/load`, I could not hit health-checks related endpoint, since the Nginx controller will re-route the request incorrectly.

**Describe the solution you'd like**
I was wondering, could we add /basePath prefix to `livez` and `readyz` ?. Is there any specific consideration why we did not set this up in the first place ?

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