**What kind of change does this PR introduce?**
Add how to disable timeout for `page.pdf()`.
**Summary**
This was mentioned in the PR that adding this feature
https://github.com/puppeteer/puppeteer/pull/7508 But it has lost at
https://github.com/puppeteer/puppeteer/pull/8593.
I'm not sure why this was removed, but I think this info is useful for
users.
**Does this PR introduce a breaking change?**
no
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.
