[Feature] Set MetricsStorage Address dynamically

[gebauerm]

As the metric storage is run on the localhost, where the benchmark is executed in the benchmark_runner, the address of the MetricStorage needs to be known in advance.
If a benchmark performs trails in pods or VMs the LatencyTracker might be znable to send results to the storage.

[gebauerm]

Use Env Variable in the resource definition as a fallback.
Automatically get the public IP in the benchmark runner.

[gebauerm]

Can now be set via an Env Variable and is retrieved every time a LatencyTracker is initialized.

Will try out on the Optuna example once it is implemented.
Looking for a better solution