Use `bun` as a task executor

### Feature description

Document or provide method to run graphile worker with Typescript tasks using [bun](https://bun.sh/)

### Motivating example

I use bun for a project, and would like to use it inside my tasks, but the instructions in the graphile worker docs only shows how to use `ts-node` with graphile worker (shown below)


### Supporting development

I...

- [X] am interested in building this feature myself
- [X] am interested in collaborating on building this feature
- [X] am willing to help testing this feature before it's released
- [X] am willing to write a test-driven test suite for this feature (before it exists)
- [ ] am a [Graphile sponsor](https://www.graphile.org/sponsor/) ❤️
- [ ] have an active [support or consultancy contract](https://www.graphile.org/support/) with Graphile