sgerrand / ex_deputy / 26501519978

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feat(constants): add defguard predicates alongside value accessors

Previously every constant under `Deputy.Constants.*` was a plain `def`,
which meant the values could not be used in guards or `case` clauses
that pattern-matched against the named code.

Hoist each value into a module attribute and add a matching
`defguard is_<name>/1`. The existing value accessors remain unchanged
so callers building request payloads still call e.g.
`Deputy.Constants.Gender.male/0`. New code can `import` the module and
write:

    case status do
      s when is_approved(s) -> :approved
      s when is_pending(s) -> :pending
    end

Doctests and a guard-clause test cover the new API.

36 of 36 new or added lines in 1 file covered. (100.0%)

318 of 321 relevant lines covered (99.07%)

14.88 hits per line