CU-8699hj2dx Revamp component initialisation

[mart-r]

Some of the component initialisation was previously handled in an invonenient way

• The arguments were set into the config
  • Which would sometimes duplicate them if things aren't handled correctly
• The arguments had tight coupling with the __init__ method
  • But compatibility wasn't clear (i.e at mypy check time)
• The arguments were set using the same set of input options
  • Which meant the above 2 were unnecessary

What this PR does

• Removes all config-based init arguments
  • These shouldn't be needed
  • But also helps avoid duplicated data
• Introduces a new class method create_new_component as part of the BaseComponent protocol
  • This is used as the entry point as well
  • It simply uses the same arguments that were previously used to get init arguments
  • It can (and often does) delegate to other existing (static) methods
• Use the above for component init
• Add some extra documentation regarding manual serialisation init arguments