[DevTools] Separate RDT Fusebox into single-panel entry points

[huntie]

Summary

Separate function entry points for react-devtools-fusebox into initializeComponents and initializeProfiler. The motivation behind this change is to separate these tabs into top-level Chrome DevTools panels (aligned with web) in React Native.

How did you test this change?

• Build react-devtools-fusebox and load into local rn-chrome-devtools-frontend project with updated call sites.

✅ Tabs can be separately initialised in individual Chrome DevTools panels

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[hoxyq]

We've shipped a lot of changes in React DevTools recently, but most of them are on the backend side. For Fusebox we only ship frontend, so we just need to double-check that everything works reliably with the new frontend (with these changes).

In any case, I am planning to make a new release once I am back from PTO.