jak2: add .gd files and level info for some ps3 test levels

[Hat-Kid]

Adds some of the internal test levels (mainly the ones that have vis files) that can be found in the PS3 version of Jak 2 to game.gp.
DGOs are not provided.

Disabled and commented out by default, can be toggled with the USE_PS3_LEVELS flag and by uncommenting the DGOs in inputs.jsonc.

Also comes with a script to generate the *.DGO.txt file for a DGO folder for use with the dgo_packer.

[LuminarLight]

Hello, I checked the list, and it seems you missed 'stadocc' (a tiny black cube) and 'ctyfence' (a giant very early outline of the city - very cool stuff). I have videos of both, but it would probably be unnecessary/inappropriate to post them here.

[Hat-Kid]

Ah, I must have missed those, I made this list like 2 months ago and just quickly combed through the folders for any levels that had vis files. I'll add them soon.