feat: bundler option in config to define desired bundler

Is your feature request related to a problem? Please describe.

You should be able to switch between webpack/rspack/vite by setting a config option.

Describe the solution you'd like

nativescript.config can handle this via:

bundler: 'webpack' | 'rspack' | 'vite' (default webpack)

This option would be used within cli to configure the compiler-service.

We could avoid this config option altogether by looking for specific config file however this option allows more versatility in that it's possible where feature parity does not match in some cases, a user could use rspack during local dev yet use webpack for production build if desired.

Describe alternatives you've considered

No response

Anything else?

No response

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