feat(sveltekit): Add bundle size optimizations to plugin options

[s1gr1d]

Makes it possible to add bundle size optimizations along with source maps options to the SvelteKit plugin options like this:

      sourceMapsUploadOptions: {
        authToken: 'token',
        org: 'org',
        project: 'project',
      },
      bundleSizeOptimizations: {
        excludePerformanceMonitoring: true,
        excludeTracing: true
      },

A bit of refactoring was done as well in the PR:

• exported all types necessary for the plugin from ./types
• create a function generateVitePluginOptions which merges all SvelteKit plugin options correctly to create the Vite Plugin options (+ tests for this function)

part of #13011

[mydea]

hmm, now that I look at this - maybe it would make more sense to add the excludeTracing option upstream to the plugins, instead of aliasing this everywhere? 😅 Would simplify this, we can soft deprecate (=stop documenting) the excludePerformance option there and just go with tracing going forward...?

We can still merge this as-is and then remove the alias once we published this upstream & bumped this in here, though!

[s1gr1d]

This was already done in this PR and and I just saw it is also released: https://github.com/getsentry/sentry-javascript-bundler-plugins/releases/tag/2.22.0

I will update the version :)

[Lms24]

Thanks for cleaning up the option merging logic!