Dynamic completion data from the build should be obtained in a structured way

[eskatos]

Expected Behavior

gradle-completion queries Gradle for the list of available tasks and their task options to obtain that data in a structured way.

Current Behavior (optional)

gradle-completion is currently parsing the output of ./gradlew tasks --all to provide completion of tasks.
This is brittle and does not provide accurate results.

Context

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[reinsch82]

This feature request is in the backlog of the relevant team and is prioritized by them.

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