[WIP] Add conditional imports with enabled property

[Copilot]

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Original prompt

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This section details on the original issue you should resolve

<issue_title>[Feature Request] Conditional imports</issue_title>
<issue_description>### Description

Allow importing a file only if a condition is met. For example:

# @import(./.env.some-file, enabled=eq(SOME_VAR, "some val")
# ---

Proposed Solution

Add a new enabled property to the @import decorator which will decide whether or not to proceed based on some boolean.

Alternatives

Currently, you could always import the file and use @disabled

Alternatively, we could think about introducing a higher level if block concept, that could enable/disable multiple arbitrary lines within the env file. Not sure it is worth the complexity.</issue_description>

Comments on the Issue (you are @copilot in this section)

• Fixes [Feature Request] Conditional imports #195

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