Make Metric Gardener Importer available via UI

[ChristianHuehn]

Feature request

Description

As a user, I want the Metric Gardener Importer added to the parser/importer so that I can import a map for my project with our Metric Gardener Importer via ui.

Acceptance criteria

• Metric Gardener Importer will be available from the import dialog
• Metric Gardener Importer dependencies have to be made available for the user
• A dialog is created to guide the user through the import process
• After the dialog is finished, the users files will be parsed and the generated cc.json will be imported and activated

Assumptions & Exclusions

Development notes (optional Task Breakdown)

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