feat(confirm): configurable alignment of choices line

[maxenglander]

Description

Currently confirm-kind events that are confirm-formatted have the choices line unconditionally padded to achieve center alignment.

Retain this behavior as the default, but allow users to left- and right-align as alternative options, e.g.:

{  
  opts = {
    views = {
      confirm = {
        format = {
          { "{confirm}", choices = { align = "left" } },
        },
      },
    },
  },
}

Related Issue(s)

Closes #1089

Screenshots

format = {
  { "{confirm}", choices = { align = "left" } },
}

format = {
  { "{confirm}" },
}

format = {
  { "{confirm}", choices = { align = "right" } },
}