Remove Emulator Connection

[jribbink]

The emulator connection has been a frequent pain point in the VSCode extension and it's time that we rip it out for a number of reasons:

• It degrades user experience by introducing a number of configuration hurdles and bugs. The extension is no longer a plug-and-play Cadence tool, it's a fully-fledged flow client. It should be a Cadence extension for helping developers write Cadence better
• The features provided were not particularly useful. Flow client capabilities belong in a tool like the CLI, and generally speaking most interactions with the chain will be either scripted (i.e. tests) or at the application level (i.e. FCL/dev wallet)
• It doesn't do what it's supposed to well. Transaction/script arguments are clunky, difficult to use. Account management is confusing. It doesn't play nice when the emulator is connected to other tools, the list goes on.
• It doesn't encourage a good development process. We should instead be pushing people into the Cadence Testing Framework to test their expected states, not running scripts ad-hoc and visually inspecting the result
• It meant parsing flow.json in javascript. This was a recipe for disaster as far as bugs go.

The list goes on. There's really no compelling reason to have these features and they are the cause of 99% of the emulator issues seen today.