Avoid * activating extension

[joyceerhl]

From the README it looks like the primary functionality that this extension exposes is via commands. This PR should resolve #75

[codecov-commenter]

Codecov Report

Merging #290 (c611b9e) into master (60ba3c7) will increase coverage by 2.17%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master     #290      +/-   ##
==========================================
+ Coverage    8.35%   10.53%   +2.17%     
==========================================
  Files           3        5       +2     
  Lines         634      655      +21     
  Branches       90       92       +2     
==========================================
+ Hits           53       69      +16     
- Misses        581      586       +5     

Impacted Files	Coverage Δ
src/common/names.ts	78.57% <0.00%> (ø)
src/common/types.ts	71.42% <0.00%> (ø)

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[tonybaloney]

Thanks for the PR!

Sadly this didn't work when the panel is used in the View model under the explorer panel, I tried onView:Explorer and onView:petsView but none of them would re-activate the extension when reloading VS Code so I've put onStartupFinished in which solves the problem.

[joyceerhl]

Thank you! FWIW, onView:petsView should suffice to reactivate an extension contributing a view to explorer on reload, and I just checked that this works as expected with the Calico Colors extension sample: https://github.com/microsoft/vscode-extension-samples/blob/fdd3bb95ce8e38ffe58fc9158797239fdf5017f1/webview-view-sample/package.json#L22-L37