feat(vscode): Introduce onboarding experience

[ccastrotrejo]

Main Code Changes

• Add extension settings for the auto download, auto azurite start, auto design time api start and dependencies path
• Add logic to download binaries (.NET, NodeJS, Azure Functions Core Tools).
• Add logic to execute binaries and update tasks.json

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What kind of change does this PR introduce? (Bug fix, feature, docs update, ...)

• Overall introduces a new way users onboard with the extension

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What is the current behavior? (You can also link to an open issue here)

• Users need to download manually .NET, Azure Functions Core Tools, Azurite and NodeJS
• Design time API triggers every time the user do right click in the workflow.json, sometimes this can last ~ 1 minute until the designer gets render
• Azurite needs to be triggered every time users want to debug a logic app. Most of the users don't know this is a required step, which confuses the overall extension experience

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What is the new behavior (if this is a feature change)?

• Introduces option to users to auto download and validate dependencies binaries or keep using their system wide installations
• Design time API now triggers automatically whenever the user opens a workspace with a logic app project, this helps to reduce the waiting time for designer no render making a smoother experiences
• Azurite now triggers automatically whenever the user opens a workspace with a logic app project. This will help reduce the uncertainty that users have whenever they want to debug logic apps, removing the manual azurite step.

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Does this PR introduce a breaking change? (What changes might users need to make in their application due to this PR?)

• No manually changes on the applications by the users. If users opt in for the dependencies binaries, tasks.json will be auto updated

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