find hooks

[s1hofmann]

Short overview
Find hooks would allow to execute actions whenever a certain image if found on screen

Use case
When using a find hook it would be possible to provide a callback to handle e.g. pop-ups etc.
So before resolving possible hooks should be awaited.

Detailed feature description
A find hook should be registered using the search needle string passed to find.
Hooks have to implement the following signature: (target: MatchResult) => Promise<void>

Additional content

Please provide any (mandatory) additional data for your desired feature

[s1hofmann]

Closed by #52