Feature: Block all dbt-loom related telemetry by default. Allow for an opt-in

[nicholasyager]

Description and Motivation

Currently, dbt-core's built-in telemetry reports on all dbt plugins loaded and the number of upstream models and packages injected. This type of telemetry presents a conflict of interest since dbt Labs' cloud offering is designed to be the "de facto" way to manage multi-project deployments, and they have a vested interest to identify and sell pricey enterprise contracts to dbt-loom users.

In an effort to provide a layer of privacy to dbt-loom users, this PR patches the dbt-core track method such that all messages that reference dbt-loom are quietly dropped and not reported to dbt Lab's Snowplow instance. This does not impact any other function of dbt-core (including other telemetry!) or dbt-loom.

If a user wants to provide this telemetry data, they can re-enable it by adding enable_telemetry: true to the project dbt_loom.config.yaml file.

Resolves: #92