feat: update typings

[timbru31]

this is part of apache/cordova#39

Platforms affected

n/a - development with TypeScript

Motivation and Context

updates typings as discussed in apache/cordova#39

Description

Updates type definition header, simplifies event types and correctly format the TSDoc.

Testing

Manual testing via development in VSCode.

Checklist

• I've run the tests to see all new and existing tests pass
• I added automated test coverage as appropriate for this change
• Commit is prefixed with (platform) if this change only applies to one platform (e.g. (android))
• If this Pull Request resolves an issue, I linked to the issue in the text above (and used the correct keyword to close issues using keywords)
• I've updated the documentation if necessary

[timbru31]

CI failure seems SauceLabs/Selenium related: UnknownError - An unknown server-side error occurred while processing the command. Selenium error: Invalid message: ERROR Internal Server Error

[janpio]

Restarted offending build.

[timbru31]

All green says my UI ;)