[Feature] Refactor InfluxDB integration + add bulk import results (⚠️ breaking change)

[alexjustesen]

⚠️ This is a breaking change for the Influxdb integration, you'll want to use the new feature to re-load your history.

📃 Description

This PR expands on the work in #1802 and provides additional hooks into the speedtest process. This PR also cleans up the tags and fields to clearly define them as:

• Tags are qualitative (non-numerical) data. Example: service, isp and server_id.
• Fields are quantitative (numerical) data. Example: download, upload and ping.

This PR introduces a regression which has been logged in #1878.

🪵 Changelog

➕ Added

• import full history to Influxdb
• tags: external_ip, server_country, server_location, healthy and service.

✏️ Changed

• moved app_name, result_id, isp, scheduled and status to tags.
• renamed id to result_id.

🔧 Fixed

• field data type issues where int/float would sometimes be written as strings.

🗑️ Removed

• tags: server_host