Add provider method get_provisioning_trace

[timidri]

Adds a method to generate a JSON description of the vsphere events. This is now only added to this provider, so it's not a required provider method at this time.

Fixes #55

Depends on puppetlabs/vmpooler#629

[yachub]

Thanks for the contribution, I really like the data coming from this. I wonder if we can convert that json object to a bit prettier output, like without the escape characters and newlines? That way we can copy the entire content of the event list after "vm provisioning trace:" and easily pipe it through jq or something to make it easier to read the events.

Also might be nice to include the common log prefix used in other places, like [!] [debian-12-x86_64] 'spicy-proton' vm provisioning trace: []

[yachub]

Thanks for the contribution, I really like the data coming from this. I wonder if we can convert that json object to a bit prettier output, like without the escape characters and newlines? That way we can copy the entire content of the event list after "vm provisioning trace:" and easily pipe it through jq or something to make it easier to read the events.

Also might be nice to include the common log prefix used in other places, like [!] [debian-12-x86_64] 'spicy-proton' vm provisioning trace: []

The above could also be done in another iteration, so up to ya'll!