Add Custom Attributes to vsphere otel receiver

[bmhkb4]

Component(s)

receiver/vcenter

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

When ingesting metrics from vsphere using the vcenter receiver, I would like to be able to access the "custom attributes" (vmware term for arbitrary key:value labels) on my vcenter objects:

Describe the solution you'd like

VMware object custom attributes to come through as prometheus labels.

Describe alternatives you've considered

n/a

Additional context

No response

[github-actions]

Pinging code owners:

• receiver/vcenter: @djaglowski @schmikei @StefanKurek

See Adding Labels via Comments if you do not have permissions to add labels yourself.

[StefanKurek]

This seems like it would be a good add and likely not overly difficult