[Svelte] Add support for Svelte 5

[Kocal]

Q	A
Bug fix?	no
New feature?	yes
Deprecations?	no
Documentation?	no
Issues	Fix #2540
License	MIT

Related to #2288

This is in work-in-progress, I still have an error in the browser while trying to render the Hello component when using the AssetMapper:

stimulus.index-S4zNcea.js:7 Error connecting controller

TypeError: Cannot read properties of undefined (reading 'call')
    at _n (client-BATiWue.js:7:27775)
    at client-BATiWue.js:7:39919
    at Hello (Hello-s876KnU.js:8:12)
    at svelte.index-TK8_2BG.js:7:28981
    at svelte.index-TK8_2BG.js:7:11011
    at Ht (svelte.index-TK8_2BG.js:7:24452)
    at Kt (svelte.index-TK8_2BG.js:7:25511)
    at dt (svelte.index-TK8_2BG.js:7:21898)
    at pt (svelte.index-TK8_2BG.js:7:22380)
    at svelte.index-TK8_2BG.js:7:11003

I didn't check how it deals with Webpack Encore yet (opened symfony/webpack-encore#1384).

[github-actions]

📊 Packages dist files size difference

Thanks for the PR! Here is the difference in size of the packages dist files between the base branch and the PR.
Please review the changes and make sure they are expected.

File	Before (Size / Gzip)	After (Size / Gzip)
Svelte
render_controller.d.ts	670 B / 359 B	688 B+3% 📈 / 369 B+3% 📈
render_controller.js	1.18 kB / 495 B	1.24 kB+5% 📈 / 513 B+4% 📈

[maxperei]

hi there, this is one of a kind.. i had a look recently about svelte 5/asset mapper and i ran into the same, so following what i thought i wrote a rollup.config.js (inspired from this repo) on top of this branch to put all the things together
after a while and some distorsions ^^ i managed to render something but it's a big mess at least
anyway i feel this is not the right way things should be done with assetmapper as i got to use a module bundler
there is already a step to compile .svelte files and it's quite unpleasant tho
i could give extra details if it sounds interesting

[Kocal]

Hey @maxperei, sure, any help would be appreciated! :)