Add preconfigured ESS instrument configs

[nvaytet]

Add pre-configured parameters for the Odin and Dream instruments, so the user does not have to copy-paste the long setup code in the notebooks.

We can now do

odin_params = tof.facilities.ess.odin(pulse_skipping=True)
model = tof.Model(source=source, **odin_params)
results = model.run()

We also move once again the location for the ess pulse profile data.
As this would break essreduce downstream, we also include a fake ess_pulse submodule, which should be phased out at a later stage.

[jl-wynen]

Looks good overall, just some minor comments.

[jl-wynen]

Can you extract this into a function for readability?

[jl-wynen]

I didn't check the numbers. I assume this is a straight copy from the notebook?

[nvaytet]

Yes it is.