[extension/zpages] zpages extension should use `confighttp.HTTPServerSettings`

[atoulme]

Is your feature request related to a problem? Please describe.
The zpages extension declares a http.Server without much option besides setting its endpoint.

Describe the solution you'd like
It would be good to instead use confighttp.HTTPServerSettings to set up the extension server.

[Sanket-0510]

I would like to take on this issue, from my understanding of the issue, we need to use httpSettingServer from confighttp go module to setup the extension server.

1. Will need to import the required go packages from go.opentelemetry.io/collector/config/confighttp,
2. Implement extension server using confighttp instance
3. use ToServer method provided by confighttp to configure the server.

I think I can address this issue. I'll open PR for this and will try to fix this.

[atoulme]

I think that’s the right plan. Holler for help if needed!

[Sanket-0510]

@atoulme I have opened a draft pull request, I don't know why but was failing onto some checks, but the server implementation looks good to me but still facing some issues, better if you can provide some feedback.

regards,
Sanket