Adds graph and visual file history telemetry

[d13]

• Adds new telemetry events for graph
• Adds new telemetry events for visual file history
• Adds type to the webview descriptor and used as a key in new showAborted and shown events
• Refactors onShowing hook to return a tuple which adds an optional context record that is mixed-in to the new show* events
• Adds telemetry context into the webview app and a low-level custom event handler

[d13]

Hey @d13, while reviewing your PR, I'd suggest the following code changes:

👉 Option 1: generic webview show event

The idea here is that the controller will transparently handle the open attempted and open successful telemetry events for the webview

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[d13]

Hey @d13, while reviewing your PR, I'd suggest the following code changes:

👉 **Option 2: from the WebviewProvider **

The idea here is similar where the controller will transparently capture the timing, but the WebviewProvider will handle the open attempted and open successful telemetry events. This leaves room for more control over what the webview wants to send, if anything at all.

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