Support for Balancer V3 hooks with stableSurge hook

[johngrantuk]

Adds support for Balancer V3 pools with hooks.

• The aim would be to add any Balancer approved/vetted hooks on a case by case basis.
• Config file is used to keep track of supported hook type and address
• Each hook must implement its own state and event handling
• Added a new event subscriber that will be used to track hook state
• Relevant hook state is used for pool maths and maths repo handles hook logic/calculation if required
• Add stableSurge hook support. These will be launched on L2s.