Orchestration: allow developers to create custom OrchestrationAccount methods

[0xpatrickdev]

What is the Problem Being Solved?

As an orchestration developer, I want to be able to define custom methods / operations for an OrchestrationAccount.

When setting up my contract, or registering a chain, I would be able to add a method like liquidStake that will be available when I later do getChain('stride').then(c => c.makeAccount()) inside a flow.

Note: similar to #10345, but with an improved DX (less open-coding).

Description of the Design

TBD

Security Considerations

Scaling Considerations

Test Plan

Upgrade Considerations