Make SQL console error messages easier to copy

[bdeboe]

Minor nuisance: when I get an error message in the "SQL Console: Messages" panel and right-click > copy values, it returns a string that was selected elsewhere in the interface rather than the error message I clicked on. Ran into this as part of experiencing #4

[gjsjohnmurray]

Upstream issue: mtxr/vscode-sqltools#987

[gjsjohnmurray]

Fixed by mtxr/vscode-sqltools#1445