feat!: Drop re-export of @anywidget/vite from main package

[manzt]

This PR let's us version the Vite plugin and anywidget separately. It is technically a breaking
change for developers using our Vite plugin and importing from anywidget/vite.

Migration

// vite.config.mjs
import { defineConfig } from "vite";
-- import anywidget from "anywidget/vite";
++ import anywidget from "@anywidget/vite";

If you are already using @anywidget/vite, there are no changes necessary.

[netlify]

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (13624a5) 98.40% compared to head (30eb192) 98.40%.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #398   +/-   ##
=======================================
  Coverage   98.40%   98.40%           
=======================================
  Files           8        8           
  Lines         440      440           
=======================================
  Hits          433      433           
  Misses          7        7           

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