[debug] create 'select and run debug configuration' statusbar item

[vince-fugnitto]

Description

Implement a new statusbar item for debug (Select and run debug configuration) which allows users to visualize the currently active debug configuration, and on selecting the item, a user can change the active configuration, and start debugging without the need to explicitly open the debug view.

Depends on the PR #5153 which implements the quick-open menu to select and run a debug configuration.

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From VSCode:

In addition, the debug status appears in the Status Bar showing the active debug configuration. By selecting the debug status, a user can change the active launch configuration and start debugging without needing to open the Debug view.