tempo_plot_covs_pmf: Plot covariates and PMF
In vlandau/tempo: Temporally-Explicit Models for Phenological Observations

Plot the covariate time series (with information on predicted coefficient magnitudes and signs) for each covariate, with a plot of the predicted transition time PMF aligned below.

tempo_plot_covs_pmf(
  x,
  draws,
  obs_id,
  confidence_intervals = TRUE,
  title = NULL
)

`x`	output from `tempo_derive()`. `tempo_derive()` needs to have been called with the `quantity` argument equal to or containing `"pmf"`
`draws`	the output from `tempo_mcmc()`
`obs_id`	The observation id (corresponding to the obs_id column in the `y` argument to `tempo_mcmc()`. `tempo_derive()` needs to have calculated the pmf for this observation (controllable via the obs_idx argument to `tempo_derive()`.
`confidence_intervals`	Boolean; Should confidence intervals be shown on the pmf plot? Defaults to `TRUE`.
`title`	character string; optional title to be placed at the top of the plot. Defaults to NULL in which case a default title is generated: "PMF and covariates for <obs_id>"