feat(svelte): Add withSentryConfig function to wrap User Svelte Configuration

[Lms24]

This PR adds the withSentryConfig wrapper function to our Svelte SDK which can be used to automatically add Sentry-specific svelte configuration options to our users' configuration in svelte.config.js. Going forward, this function will allow us to add more sentry-specific config items, such as additional preprocessors to the config without having to ask our users to adjust their config stuff every time we introduce changes.

We already have a concrete use case for adding another preprocessor to fix #5923 which will be addressed in a follow-up PR.

The change is fully backward-compatible with how we previously instructed users to add the componentTrackingPreprocessor explicitly to their set of preprocessors in their config. However, to make it clear that withSentryConfig is the way forward, this PR deprecates componentTrackingPreprocessor and in v8, we'll remove it from our public exports.

Additionally, this PR

• adds tests for withSentryConfig.
• removes the svelte-internal types we previously copied from Svelte source code into our types file. I think it doesn't do us any harm to switch to the actual types because if they ever change we'd have problems either way. Happy to revert this though if reviewers think this might cause issues.

[AbhiPrasad]

Good tests!

[AbhiPrasad]

LGTM - feel free to take any decision you want on my code suggestion