Zowe Explorer to use VS Code Log Level for built in enhancements

[JillieBeanSim]

born from issue: #2271
vs code related issue: microsoft/vscode#170450

VS Code now allows extenders Output Channel to have a log level setting control to change the level at a whim or save the new as default, removing the need to go directly into the settings to make the change. This is only available for extenders if they use the VS Code log level enum, per related issue.

This would be a really nice feature to have with our extension but would be considered a breaking change and would need to be done either in v3 or another major release.

VS Code log level setting can be accessed via Command Palette

[github-actions]

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[JTonda]

Research Items:

• Can this be implemented in a non-breaking way by linking to the existing setting?
• What VSCode engine does this require?: 1.73