Run code lens command should run as a task in the VSCode plugin

[dulajdilshan]

Description:
Currently, when we hit Run in the code lens, we run the Ballerina source code using Ballerina CLI creating a new terminal instant as the GIF below.

We need to run the Ballerina source as a task in the VSCode

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[dulajdilshan]

Developed this is to use tasks API in VScode. Now working on adding debug-adaptor behavior for the VScode. With that we can have a stop button to stop a running service.