Moves pnpm generate scripts into rust tools scripts

[cloutiertyler]

Description of Changes

This PR removes some bash commands from the various pnpm generate scripts, and instead moves them into Rust scripts. It also adds module bindings for the example typescript template clients which should be in there anyway, so that we can test the template clients without running spacetime init.

API and ABI breaking changes

None

Expected complexity level and risk

2

Testing

• [x] I ran all the Rust code. You can confirm that the generated files are correct by running pnpm generate in the root.