Refine CCL HaloProfile integration for the data vector

[bclevine]

Goal

Currently, in order to take advantage of the HaloProfile methods in CCL, we generate a new HaloProfileGeneric class in /src/dsf/data_vector/ccl_integration.py and kind of hack together the input components. If we want this to be integrated into CCL in the future, we should be more careful about how we do this.

The best solution is probably to come up with some new DeltaSigma class which is compatible with CCL that contains the relevant parts of the HaloProfile class but does not inherit from it.

Scope

Refactor /src/dsf/data_vector/ccl_integration.py to create a standalone DeltaSigma class rather than the HaloProfileGeneric class which currently exists.

Acceptance criteria

• HaloProfileGeneric is replaced by a new standalone class.
• The new class integrates correctly into the rest of the datavector modeling code.
• Documentation exists for the new class and its functions.