Add Fine-Grained Authz Proxy Example

[j616]

Details

This PR adds an example implementation of fine-grained authorization as described in AppNote0016.

This implementation is intended as documentation only and comes with numerous limitations highlighted in the READMe.

Jira Issue (if relevant)

Jira URL: https://jira.dev.bbc.co.uk/browse/CLOUDFIT-5470

Related PRs

Where appropriate. Indicate order to be merged.

Submitter PR Checks

(tick as appropriate)

• PR completes task/fixes bug
• API version has been incremented if necessary
• ADR status has been updated, and ADR implementation has been recorded
• Documentation updated (README, etc.)
• PR added to Jira Issue (if relevant)
• Follow-up stories added to Jira

Reviewer PR Checks

(tick as appropriate)

• PR completes task/fixes bug
• Design makes sense, and fits with our current code base
• Code is easy to follow
• PR size is sensible
• Commit history is sensible and tidy

Info on PRs

The checks above are guidelines. They don't all have to be ticked, but they should all have been considered.