BarthPaleologue/CosmosJourneyer

To complete this issue, add allowImportingTsExtensions: false to tsconfig.base.json. There probably won't be any new error to fix as the repo already follows this rule implicitely.

Gas planet material is currently a ShaderMaterial. However it would be better to make it BSL based in order to make it more integrated with BabylonJS features and allow to generate WGSL instead of translating from GLSL at runtime. For this, change GasPlanetProceduralMaterial…