Migrate from `npm ci` to bun install

[Datron]

bun install is faster than npm, but does not change any other behaviour. Its an easy win for faster setup

[ShubhranshuSanjeev]

Is this really needed? We don't even use npm that much, just once at the time of project setup and not even that many dependencies.

[Datron]

Its needed for CI builds, not local builds

[ShubhranshuSanjeev]

Still, npm is not the one taking time here, cargo install is the culprit, that's the longest running command in our builds.

[Datron]

cargo install is cached by the github action. npm ci takes 3 minutes on the pipeline. Bun should be able to make this faster