feat: allow random_seed and node_redshifts to be set in TOML profiles

[steven-murray]

This updates the reading/writing of TOML "template" files to allow random_seed and node_redshifts to be written there.

Fixes #559

In particular, this allows for much easier loading of cached coeval boxes after running a simulation. E.g. in the run script you might have...

import py21cmfast as p21c

inputs = p21c.InputParameters.from_template("EOS21", random_seed=1, node_redshifts=[5,6,7,8,9,10])
inputs.write_template("my_parameters.toml")
p21c.run_lightcone(inputs=inputs, write=True)

Now, after running that very large simulation, you would like to read some boxes with the nifty RunCache tool in a separate script. Before this PR you must do:

import py21cmfast as p21c

inputs = p21c.InputParameters.from_template("my_parameters.toml", random_seed=1, node_redshfits=[5,6,7,8,9,10])
....

And hope that you kept the random seed and node redshifts in sync between the two scripts.

Now you can just do:

import py21cmfast as p21c
inputs = p21c.InputParameters.from_template("my_parameters.toml")
...

I made it so that by default if mode='full' in write_template() the full information is written (including random seed and node redshifts). However, if mode="minimal" then these are not written. A minimal template is meant to be more like a "physical model" (like our built in templates) which doesn't try to specify what the exact random seed is.

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[steven-murray]

@DanielaBreitman you might be interested in this too

[codecov]

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