feat: Improve test convention, update to v8

[bigtimebuddy]

Changes

• Convert ./test folder to Jest-convention src/__tests__, encourage the co-location of tests and source
• Adds tsconfigTypes to optionally define a configuration for generating types
• No longer adds test folder to the files to lint
• Adds support for importing *.wgsl files as string in Jest
• Fix: ensure tsconfig is set (now required for eslint@9)
• Update test code to pixi.js@8 and example to use importmap
• Add additional tsconfig options for more strictness
• Removes triple-slash type hack, you can now use declare global in src and that will be outputted instead