refactor: deprecate all config types from the main Vitest entrypoint, introduce SerializedConfig type

[sheremet-va]

Description

All config types rely on node-specific types (from vite, for example). I have moved all of them to vitest/node from vitest (which should be runtime agnostic), but we should also review if all of them need to be exported.

I also started to type the serialisable config and runtime config that are available in vitest entry point and can be imported in your tests.

This PR introduces SerializedConfig that should be used at runtime instead of vitest - previously we just merged it with the ResolvedConfig and removed methods, now it is created manually so it's harder to miss something incompatible. I also plan to add a validator for resolved config values in the future and refactor how config is resolved (right now it's all over the place, but the goal of this PR is to introduce the groundwork and start deprecating node-related types in the main entry point)

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