Chore: adding integration tests to plugin meta extractor

[mckn]

Description

The plugin meta extractor works differently depending on being run in typescript 4 or typescript 5. To make sure that we support extracting information from plugins using either version of typescript we should add a set of tests to the plugin meta extractor.

One idea is to scaffold two different plugins in a sub directory of the plugin meta extractor that can be used to extract information from those plugins. Each plugin should run a different version of typescript.