Support for consul style configurable statsd > metrics_prefix

[ghost]

Is your feature request related to a problem? Please describe.
Need support for overriding metric name with metrics_prefix for vault monitoring, similar to Consul

Describe the solution you'd like
Adding configuration such as the following should result in statsd metrics being emitted with the prefix instead of default 'vault.*'

"telemetry": {
"statsd_address": "ADDRESS:PORT",
"disable_hostname": true,
"metrics_prefix": "<Custom_vault_Prefix>"
}

Describe alternatives you've considered
None

Explain any additional use-cases
This will enable us to capture metrics for team specific vault deployments

Additional context
Add any other context or screenshots about the feature request here.

[ncabatoff]

Fixed in #8340.