Certain useful TypeScript types no longer exposed since 15.2.0

[niieani]

Affected version: 15.2.0+

Creating an issue by request of @jrandolf.

At least two issues were caused by #8584:

• not possible to access the RemoteObject of a JSHandle anymore (details)
• Protocol is longer re-exported, meaning the consumer needs to keep devtools-protocol version in sync with the one used by puppeteer, at least if they don't want to reach into a transitive dependency (i.e. undeclared in package.json).

Example where this is an issue: niieani/puppeteer-intercept-and-modify-requests#4 (files)

[OrKoN]

I suggest we expose the remote object on JSHandle as an official documented API and make the protocol types available so that you don't need to install the devtools-protocol package yourself.