feat: separate puppeteer and puppeteer-core (#9023)

This PR moves the puppeteer source code into separate mono-repo packages:

- `puppeteer` and `puppeteer-core` are now separated into their own
packages.
- `puppeteer-core` has a new exports called `puppeteer-core/internal`
for internal usage.

Tests and various tools have been updated to accommodate the migration.

tsconfig.base.json

@@ -3,9 +3,12 @@
     "allowJs": true,
     "alwaysStrict": true,
     "checkJs": true,
+    "composite": true,
     "declaration": true,
     "declarationMap": true,
     "esModuleInterop": true,
+    "incremental": true,
+    "module": "ESNext",
     "moduleResolution": "node",
     "noFallthroughCasesInSwitch": true,
     "noImplicitAny": true,