refactor: Improve AST-related types readability & fix existing issues

[xeho91]

To summarize, the main objective - fix CI check

What has been done

1. Update imports & usage for types related to AST nodes.
   I've created two types SvelteAST & ESTreeAST that are used across entire codebase (imported from #parser/ast).
   I figured when wrapped into two namespaces is it easier to read and to quickly see from which AST they come from.
   This project is unique for using both Svelte AST and ESTree AST, so I hope this clears possible future confusion.
2. After updating svelte to latest rc version (where AST types from svelte/compiler are finally exposed),
   I could see the existing types issues related to previous PR attempting to fix breaking change in Svelte AST
   (references: [Bug]: autodocs using svelte-csf v5 does not render individual story within docs #199 fix(parser): Resolve autodocs tag issue and extracting rawCode #201). So, I solved them + refactored them a little bit with early returns. There are small
   logic duplications, but I didn't mind them as they are easier to read and maintain than what having very long and
   complicated if/else statements.

What is not included

There are only warnings lefts with deprecations related to <svelte:component> and <script context="module">.
I'd rather them being solved them in separate PRs.

[xeho91]

Apologies, wrong --head branch used (used GitHub CLI), and I can't edit it 😭

#209