fix(core): add new launch.json and fixed breakpoints not working

[ThimoDEV]

This PR adds a new launch.json so a maintainer of TresJS can use breakpoints during development.

How to use?

• First setup the project as normal if you didn't have that already
• Run pnpm playground
• Press F5 or the play button in your Run and debug window
• Set breakpoints in the TresJS core code or in your playground to test in that way

I had this weird issue where the localhost url wasn't working. I set the port on all to 3000 which seems to make the dev server more stable. I don't know if this impacts releases in any way?

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[ThimoDEV]

@alvarosabu Is there anything more you need/changed for this to be merged? So I can help get you there :)