feat(sveltekit): Add wrapper for client load function

[AbhiPrasad]

ref #7413

Building off the work in #7416, this adds a basic wrapper for client-side load functions. This was used to test out if SvelteKit can reconcile the imports correctly while bundling.

This only adds error monitoring functionality, the performance monitoring work is tracked by #7413

[github-actions]

size-limit report 📦

Path	Size
@sentry/browser - ES5 CDN Bundle (gzipped + minified)	20.41 KB (+0.07% 🔺)
@sentry/browser - ES5 CDN Bundle (minified)	63.3 KB (+0.05% 🔺)
@sentry/browser - ES6 CDN Bundle (gzipped + minified)	18.99 KB (+0.06% 🔺)
@sentry/browser - ES6 CDN Bundle (minified)	56.21 KB (+0.06% 🔺)
@sentry/browser - Webpack (gzipped + minified)	20.65 KB (+0.07% 🔺)
@sentry/browser - Webpack (minified)	67.44 KB (+0.05% 🔺)
@sentry/react - Webpack (gzipped + minified)	20.68 KB (+0.07% 🔺)
@sentry/nextjs Client - Webpack (gzipped + minified)	52.09 KB (+0.05% 🔺)
@sentry/browser + @sentry/tracing - ES5 CDN Bundle (gzipped + minified)	33.66 KB (+0.04% 🔺)
@sentry/browser + @sentry/tracing - ES6 CDN Bundle (gzipped + minified)	26 KB (+0.02% 🔺)
@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)	61.3 KB (+0.02% 🔺)
@sentry/browser + @sentry/replay - ES6 CDN Bundle (gzipped + minified)	54.39 KB (+0.03% 🔺)