866d34ee11
This PR fixes the fact that currently if you have:
```ts
page.on('request', request => {
})
```
Then `request` will be typed as `any`. We can fix this by defining an
interface of event name => callback argument type, and looking that up
when you call `page.on`.
Also includes a drive-by fix to ensure we convert response headers to
strings, and updates the types accordingly.
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| js-cjs-import-cjs-output | ||
| js-cjs-import-esm-output | ||
| js-esm-import-cjs-output | ||
| js-esm-import-esm-output | ||
| ts-cjs-import-cjs-output | ||
| ts-esm-import-cjs-output | ||
| ts-esm-import-esm-output | ||