Add SvelteKit SDK package and SDK initialization

[Lms24]

First Step to the new SvelteKit SDK: Setting up the package and figuring out how we can provide the best SDK init DX.

Ideally, we'd like to achieve similar DX as in the NextJS SDK: Users provide sentry.(server|client).config.(ts|js) config files with a Sentry.init call to the respective SDK. These files are added to the entry points of the client/server bundles and that's how we initialize the SDK as early as possible in the application life cycle.

Tasks

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1. chore(sveltekit): Add boilerplate SvelteKit SDK package #7365
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2. ref(node): Partially remove dynamic require calls #7377
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3. feat(sveltekit): Inject Sentry.init calls into server and client bundles #7391
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4. feat(sveltekit): Add SvelteKit client and server init functions #7408
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Alternative Approach:

If the "entry point injection" doesn't work, we can still resort to initializing the SDKs in hooks.(client|server).ts files, which are part of SvelteKit and initialize very early in the life cycle.

Once we have a working auto-wrapping approach, we could theoretically also explore injecting the init call into the hooks files.