performance: consider bundling extension

[hyangah]

Original bug report is microsoft/vscode-go#2997

This extension got bigger. vsce recommends https://aka.ms/vscode-bundle-extension

This extension consists of 2266 files, out of which 1509 are JavaScript files. 
For performance reasons, you should bundle your extension: 
https://aka.ms/vscode-bundle-extension . You should also exclude unnecessary 
files by adding them to your .vscodeignore: https://aka.ms/vscode-vscodeignore

microsoft/vscode-extension-telemetry#41
(due to microsoft/ApplicationInsights-node.js-native-metrics#4) was one of the road blockers. We can probably prune the dependency.

Not sure about interaction with debug adapter yet.

[gopherbot]

Change https://golang.org/cl/234530 mentions this issue: src/telemetry.ts: remove telemetry

[gopherbot]

Change https://golang.org/cl/236741 mentions this issue: [release] src/telemetry.ts: remove telemetry

[OneOfOne]

Is anyone working on this? if not I'd like to take work on it.

[hyangah]

@OneOfOne i don't know anyone working on this. Last time I attempted, I was stuck at testing. Contribution is welcome!