Suggestion: make the metrics host configurable

[eladamittai]

Validations

• [X] I believe this is a way to improve. I'll try to join the Continue Discord for questions
• [X] I'm not able to find an open issue that requests the same enhancement

Problem

The metrics host is hard coded in the core/util. I for example want to create an adapter for the posthog metrics to grafana, and I can't because I can't change the host without rebuilding the plugin.

Solution

Make the host a part of the config.json. You could still use the previous host as defaults. It seems like a relatively simple task.