Add logging for kernel context keys

[Yoyokrazy]

Re: #200896

Added debug logging to diagnose context key issues causing disappearing global toolbar buttons (restart).

[DonJayamanne]

@Yoyokrazy If you only need this for debugging purposes, then you can

• Make this change, create a PR as you have done
• Take the VSIX from the build output
• Share the VSIX with users, ask them to test by installing this VSIX manually
• Capture the logs

Else we end up with a lot of logs when users click around/typing etc (as such actions causes these context keys to change and that would produce an excessive amount of logging for all users, which wouldnt be ideal)

[DonJayamanne]

Only requesting chanages so as to ensure we do not merge this PR,
Feel free to use the VSIX and share that with the users for capturing logs.