Add an LS extension for the generation of worker models

[nipunayf]

Description:

An LS extension is required to analyze generated Ballerina code with workers and create a JSON model to visualize the flow between these workers. The extension should consider a given function definition (resource, main, etc.), and analyze the metadata through annotations, and examine the graph through the send and receive actions.

[nipunayf]

Closing this issue as we are discontinuing this model.