GH-186 adding full (documented)`OAuth2` Support

[francoisledroff]

Description

co-authored-by: Pulkit Gupta 92841386+pulguptaAdobe@users.noreply.github.com

Related Issue

• GH-186
• GH-172

How Has This Been Tested?

• old JWT Integration Test are passing
• added a new stage_oauth_itest workflow and aio_stage_oauth environment and GH oauth e2e

Types of changes

This PR introduces version 2.0.0 with a few breaking changes to reach simplified code and easier API in our sdk:

• added oAuth support in aem (GH-186)
• simplified/trimmed-downaio-lib-java-ims API:
  • the ImsService interface is unified (wether leveraging JWT or oAuth)
  • all systemEnv, properties and configMap Builders methods are removed and replaced by
    • an enriched WorkspaceUtil allowing a safer load of the system properties.
  • with simpler JWT support
    • trimming down the privateKey configurations options to just one: using a base64 encoded pkcs8 format
• updated the various docs and test drive accordingly (GH-172)
• updated the various unit-tests and adding a bit for junit coverage
• deleted of a few unused configurations files
• added a new stage_oauth_itest GH workflow and aio_stage_oauth environment and GH oauth e2e

• [ ] Bug fix (non-breaking change which fixes an issue)
• [x] New feature (non-breaking change which adds functionality)
• [x] Breaking change (fix or feature that would cause existing functionality to change)