Replace Karate Debugger Startup process

[ivangsa]

Current Karate Debugger Startup process is slow and cumbersome:

• Karate java debug server process is started as ShellExecution
• Karate-Runner creates a file watcher and and progress dialog and waits for file target/karate-debug-port.txt
• DebugServer is started on a random port and random port is writtern to file
• Karate-Runner starts a debug session and connects to karate DebugServer port
• Karate-Runner/DebugSession sends debuging information: feature and breakpoints
• When debuged feature is finished karate DebugServer exits and is discarded

New workflow will be:

• Start Karate DebugServer on a given port using a node child_process.spawn #5
• Start DebugSession and connect to DebugServer (using a timeout that allows time for DebugServer to start)
• Keep Karate DebugServer open so future DebugSessions connect to this already open DebugServer saving a few secconds on subsequent debuging sessions