[Feature Req.] Ability to store node_redshifts in the TOML spec

[steven-murray]

Is your feature request related to a problem? Please describe.

It's annoying to have to read a parameter TOML file, then read in a corresponding ICs box to get the appropriate node redshifts, because they don't exist in the TOML.

Describe the solution you'd like

Ability to save the node redshift info in the TOML. I think we could support either, or both of, the following specs:

[node_redshifts]
func: get_logspaced_redshifts
zmin:
zmax
zstep:

[node_redshifts]
[5,6,7,8,9,10,...]

Describe alternatives you've considered

It may be easier long-term to only store the explicit node_redshifts instead of allowing functions/parameters. Not sure.