Fixes #16 Add netbeans.serverVmOptions for Language Server

[Moataz-Aldawood]

- Added netbeans.serverVmOptions configuration array to package.json
- Updated LaunchInfo in nbcode.ts to accept serverVmOptions
- Applied custom JVM arguments to the NBLS headless launch process
- Solves Java heap space OutOfMemory exceptions by allowing -J-Xmx overrides

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