[Feature]: automatically load environment variables if a dotenv file is detected within the project root

[purpleclay]

Describe your feature

Include support for automatically loading environment variables into the nsv execution context. This allows environment variables to be set for use within hooks etc. It is also an important feature that will enable functionality such as CI Detection within a Dagger context.

Ensure the order of precedence when setting variables remains the same:

1. CLI flags; followed by
2. Explicit Environment Variables; followed by
3. DotEnv Global Environment Variables

Any additional information?

No response

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