Upload source maps automatically in the SvelteKit SDK

[Lms24]

Add the Sentry Vite Plugin to upload source maps automatically for @sveltejs/adapter-node users:

Research/PoC:

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1. [Needs Research] find correct source maps generation config for SvelteKit apps + adapters
2. [Spike] Investigate why server-side source maps are not emitted correctly ootb (upstream contribution?)
3. Ensure source map upload runs at the buildEnd hook
4. Avoid running upload twice
5. Try out DebugId (done, was erroneous, will revisit later)

Tasks

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1. Rework SvelteKit SDK build time API #7787
   Package: sveltekit Type: Improvement +2
   
2. feat(sveltekit): Add Sentry Vite Plugin to upload source maps #7811
   +0
   
3. fix(sveltekit): Rewrite server-side stack frames to match uploaded artifacts #7831
   +0
   
4. fix(sveltekit): Improve server-side grouping by removing stack frame module #7835
   +0
   
5. fix(sveltekit): Don't crash build when CLI credentials are missing #7846
   +0
   
6. feat(sveltekit): Read adapter output directory from svelte.config.js #7863
   +0
   

ref #6692