<!-- Thanks for submitting a pull request! Please provide enough
information so that others can review your pull request. -->
**What kind of change does this PR introduce?**
types fix
**Did you add tests for your changes?**
No
**If relevant, did you update the documentation?**
Not relevant
**Summary**
I am updating `import`s of `devtools-protocol` to always use named
import instead of the default.
For some reason, typescript doesn't understand when it is imported as
default.
```
node_modules/puppeteer-core/lib/esm/puppeteer/common/TargetManager.d.ts:23:59 - error TS2694: Namespace '"/Users/kyrylo/pacakge/node_modules/puppeteer-core/node_modules/devtools-protocol/types/protocol"' has no exported member 'Target'.
23 export declare type TargetFactory = (targetInfo: Protocol.Target.TargetInfo, session?: CDPSession) => Target;
~~~~~~
Found 1 error in node_modules/puppeteer-core/lib/esm/puppeteer/common/TargetManager.d.ts:23
```
**Does this PR introduce a breaking change?**
No
<!-- If this PR introduces a breaking change, please describe the impact
and a migration path for existing applications. -->
**Other information**
I am updating `import`s of `devtools-protocol` to always use named
import instead of the default.
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.
