gen_ssm_inits: Generate initial values for a state-space SRA fit
In bstaton1/FitSR: Functions to Fit and Summarize SRA Models

Takes the output of the SimFit functions to prepare for fitting a state-space spawner recruit model using JAGS

1	gen_ssm_inits(params, obs, maturity, n_chains)

`params`	a list object created by `SimFit::init_sim()` or `kusko_data_prep()$params`. Contains the driving parameters and dimensional variables.
`obs`	a list object created by the functions that generate observations in the `SimFit` package or the `kusko_data_prep()$obs` function.
`maturity`	a character vector of length 1: either `"simple"` or `"complex"`. If the latter, then initial values will be generated for the dispersion parameter of the Dirichlet distribution that generates brood year specific maturation schedules.
`n_chains`	a numeric vector of length 1: the number of MCMC chains to generate initial values for