refactor confhandler creation

[Aurashk]

Description

Fixes issue #952

This is a refactor which aims to preserve the original behaviour, but makes it so that each ConfHandler subclass is properly typed and easier to understand

Type of change

• New feature / enhancement
• Optimization
• Bug fix
• Breaking change
• Documentation

List of required branches from other repositories

WHAT PRs NEED TO BE INCLUDED TO MAKE THE CHANGE.

Change log

WHAT HAS CHANGED.

Suggested manual testing checklist

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Developer checklist

Prior to marking this as "Ready for Review"

Tests ran on: WHAT HOSTNAME from release RELEASE_NAME

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• Code is clearly commented.
• New unit tests have been added, or is documented in # ISSUE NUMBER
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Reviewer checklist

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[Aurashk]

Current status - seems to be working - pytest passing and interactive shell basic test works. But now needs a careful rebase for the merge conflicts because broadcaster code was deleted.

Also this refactor might be even better if the factory methods in ConfHandler e.g. from_json were using generics for return type (not sure if this is possible but worth testing). That way the type resolution will work better.