New component: HAProxy receiver

[atoulme]

The purpose and use-cases of the new component

HAProxy offers useful statistics.
We have a haproxy collectd monitor that is currently able to poll metrics by calling out to a socket exposed by haproxy, sending commands and parsing its output:
https://github.com/signalfx/collectd-haproxy

I would like to offer an OpenTelemetry native replacement.

Example configuration for the component

haproxy:
  socket: /var/run/haproxy

Telemetry data types supported

metrics

Is this a vendor-specific component?

• This is a vendor-specific component
• If this is a vendor-specific component, I am proposing to contribute this as a representative of the vendor.

Sponsor (optional)

No response

Additional context

No response

[MovieStoreGuy]

I am happy to sponsor this one since my team's would appreciate a replacement, though I don't have a lot of time within this calendar year to be able to help get this out.

[atoulme]

Thanks @MovieStoreGuy !

[atoulme]

Closing as the component is accepted. Will open further issues for development.