Instantiate Transforms Using Hydra

[Pale-Blue-Dot-97]

Is your feature request related to a problem? Please describe.
Transforms are currently defined via the config but are not instantiated using hydra. This results in a clunky YAML syntax and various conditionals so a user can outline the program of transforms they want. There are also somethings that are not currently possible, such as passing args to transforms that are not primitive types.

Describe the solution you'd like
Use hydra.utils,instantiate to build the transforms. This can handle nested instantiates (superseeding some of the currently minerva defined functionality` as well as opening up new functionality.

Describe alternatives you've considered
Continue to add new conditionals and adaptions of existing transforms for new use cases as and when required.

Additional context
Other elements of the config already support hydra.utils.instantiate such as the optimiser or loss function. Making this change will continue the move towards consistency and better UX across minerva.