feat(sveltekit): Inject Sentry.init calls into server and client bundles

[Lms24]

This PR adds an initial version of Sentry.init call injection to our new SvelteKit SDK:
Specifically, we add a withSentryViteConfig wrapper function, which users will need to wrap around their Vite config. This will:

• Inject a Vite plugin which takes care of injecting Sentry.init calls from sentry.(client|server).config.(ts|js) files, providing a DX identical to the NextJS SDK.
  • The server-side init is injected into the server index.js file
  • The client-side init is injected into the app.js file
  • The injection works both for production builds (with the Node adapter for now) as well as for a local dev server
• Add the root directory of the project to the allowed directories for the Vite dev server. We need this so that the client config is correctly picked up by the Vite dev server.

With this in place, we can start adding error monitoring and performance monitoring to the SDK.

ref #7348 #6692

[github-actions]

size-limit report 📦

Path	Size
@sentry/browser - ES5 CDN Bundle (gzipped + minified)	20.21 KB (-0.01% 🔽)
@sentry/browser - ES5 CDN Bundle (minified)	62.89 KB (0%)
@sentry/browser - ES6 CDN Bundle (gzipped + minified)	18.85 KB (0%)
@sentry/browser - ES6 CDN Bundle (minified)	55.8 KB (0%)
@sentry/browser - Webpack (gzipped + minified)	20.6 KB (0%)
@sentry/browser - Webpack (minified)	67.32 KB (0%)
@sentry/react - Webpack (gzipped + minified)	20.62 KB (0%)
@sentry/nextjs Client - Webpack (gzipped + minified)	48.51 KB (+0.11% 🔺)
@sentry/browser + @sentry/tracing - ES5 CDN Bundle (gzipped + minified)	27.49 KB (+0.15% 🔺)
@sentry/browser + @sentry/tracing - ES6 CDN Bundle (gzipped + minified)	25.75 KB (+0.14% 🔺)
@sentry/replay ES6 CDN Bundle (gzipped + minified)	43.17 KB (0%)
@sentry/replay - Webpack (gzipped + minified)	37.19 KB (0%)
@sentry/browser + @sentry/tracing + @sentry/replay - ES6 CDN Bundle (gzipped + minified)	61.16 KB (+0.07% 🔺)
@sentry/browser + @sentry/replay - ES6 CDN Bundle (gzipped + minified)	54.33 KB (0%)