Connect-eaas-core

What's Changed
* LITE-26452: Switch from mkautodoc to mkdocstrings and add isort by gab832 in https://github.com/cloudblue/connect-eaas-core/pull/63
* Switch from multiple transformation classes to single class by ffaraone in https://github.com/cloudblue/connect-eaas-core/pull/65


**Full Changelog**: https://github.com/cloudblue/connect-eaas-core/compare/27.2...27.3

Improve test client, mock api call to inject installation admin client.

Add injection function for webapps and utility methods for eventsapps to obtain a client for installation administration.

Add extension info to web call context.

Improve test client to auto mock call for installation_admin_client internally.

Add support for getting an installation admin client.