File based tests for the normalizers. supply a raw file and an expected serialized output file and this will create a new ad hoc test

[underdarknl]

Changes

This adds a tester which looks for specific input and output files in the normaliser folders.
It then runs the input agains the normalizer and checks if the output matches the output file.

Issue link

#2534

Code Checklist

• All the commits in this PR are properly PGP-signed and verified.
• This PR only contains functionality relevant to the issue; tickets have been created for newly discovered issues.
• I have written unit tests for the changes or fixes I made.
• For any non-trivial functionality, I have added integration and/or end-to-end tests.
• I have performed a self-review of my code and refactored it to the best of my abilities.

Communication

• I have informed others of any required .env changes files if required and changed the .env-dist accordingly.
• I have made corresponding changes to the documentation, if necessary.
• I have included comments in the code to elaborate on what is not self-evident from the code itself, including references to issues and discussions online, or implicit behavior of an interface.

---

Checklist for code reviewers:

Copy-paste the checklist from the docs/source/templates folder into your comment.

---

Checklist for QA:

Copy-paste the checklist from the docs/source/templates folder into your comment.

[underdarknl]

Todo's:

• Design a input/output filename scheme.
• Add documentation for creating and running these tests.
• Validate each yielded object one by one against the expected objects
• Optionally provide a way to only check certain fields on the yielded objects, instead of all
• Use JSON content for output files
• Optionally allow the input__ooi to be specified

[underdarknl]

As discussed, I will add Python file support next to Json file support for output files.
The discussion around filenames is still open, and projecting these changes onto testing of reports, and testing of individual plugins is also still open.