Replace ESLint and Prettier with Biome

[donmccurdy]

For me, ESLint has become too complex — too many dependencies to keep updated, too much configuration — for my personal projects. In particular, the ESLint v9 moves to "flat configs" and (despite the migration guides and automatic upgrade tools) I've found that to be a painful change that distracts from the work I'd like to be doing.

I'd like to replace ESLint with Biome (https://biomejs.dev/) which ships as a single package without transient dependencies. This would also mean replacing Prettier: I have no issues with Prettier, but consolidating into a single dependency would be nice.

I made the same changes in ktx-parse recently (donmccurdy/KTX-Parse#167), and haven't regretted that change, so I'd like to do the same here and in https://github.com/donmccurdy/typescript-library-template for future projects.