improve debug logs

[dominikg]

Describe the problem

currently debug logging is very verbose, logging most hook invocations and a lot of other things. Leading to information overload.

It also uses vite:vite-plugin-svelte as namespace which puts it under vite instead of next to it.

Describe the proposed solution

• remove logs where the information isn't needed or can be obtained with vite-plugin-inspect
• change namespace to vite-plugin-svelte
• a recent change introduced debug namespaces as an additional param, use them for grouping

Alternatives considered

keep as is

Importance

nice to have

[dominikg]

technically a breaking change if someone has used DEBUG="vite:vite-plugin-svelte" before, so put it in 3.0