Simplify the repository structure and CI flows of the identus-cloud-agent repository

[yshyn-iohk]

Proposed feature

In simplifying the Identus projects and adopting the cloud-agent repository, we can move everything unrelated to the cloud-agent to other repositories and make a repo a pure Scala project.

Feature description

The following actions were proposed:

1. replace the MegaLinter with the native linter (per programming language) - Megalinter brings more problems with the configuration and enabling/disabling the linters and rules
2. deprecate the infrastructure directory
3. move e2e integration-tests to another repository (TODO: discuss with @amagyar-iohk)
4. move the performance tests to another repository (TODO: discuss with @amagyar-iohk)
5. move docs to the documentation repository
6. move the prism-node project to the prism-node repository and publish the corresponding dependency (TODO: discuss with @FabioPinheiro)
7. deprecate the examples directory (discuss with @hyperledger/identus-maintainers)
8. clean up and refactor the workflow files (it's going to reduce the CI time of the project)

Anything else?

No response