Add activation timing logging to the extension + scripts for comparing load times

[PEZ]

• Measuring the time it takes from start to end of extension activate()
• Added some utility scripts for comparing load times between bundles

Example run of a comparison:

% script/bundle-compare.sh /Users/pez/.vscode/extensions/betterthantomorrow.joyride-0.0.32 /Users/pez/Downloads/joyride-0.0.33-rewrite-clj-77ebb270/extension 100
Comparison of:
  1. /Users/pez/.vscode/extensions/betterthantomorrow.joyride-0.0.32
     Size: 1351978 bytes
     Load time average: 48.33 ms
  2. /Users/pez/Downloads/joyride-0.0.33-rewrite-clj-77ebb270/extension
     Size: 1591118 bytes
     Load time average: 55.13 ms
Loaded the bundles 100 times each.
Size difference: 239140  (17.6%)
Load time difference: 6.806672046184534  (14.0%)

• [x] I have read the developer documentation.

• [ ] This PR corresponds to an issue with a clear problem statement.

• [ ] This PR contains a test to prevent against future regressions

• [ ] I have updated the [Unreleased] section of the CHANGELOG.md file with a link to the addressed issue.

[PEZ]

You'll have to do a post-merge review. 😄 (It's just dev/maintenance utility stuff anyway.)