Modest Refactor: Allow use of definitions directly from the holiday repository

[voughtdq]

I wanted to be able to use the definitions repository directly. This way, it's simply a matter of updating the dep entry in mix.exs. All changes are backwards compatible and these changes are opt-in only. All modifications were made under the provided nix flake environment.

• Wrap year ranges
  • in_year_ranges?/2 was failing because it expects a list for the first argument, but some rules produce a map instead of a list.
• Add missing in_year_range/2 clauses
• Use deps to get holiday definition files
• Add missing date functions
  • For Holidefs.Definition.CustomFunctions:
    • Add orthodox_easter_julian/2 as an alias
    • Add Rosh Hashanah dates up to 2052
    • Add Yom Kippur dates up to 2052
    • Add Matariki dates up to 2052
    • Add epiphany/2
    • Add to_near_monday_after/2
    • Add qld_brisbane_ekka_holiday/2
    • Add qld_kings_bday_october/2
    • Add ch_be_zibelemaerit/2
    • Add saint_josephs_day/2
    • Add saint_peter_and_saint_paul/2
    • Add assumption_of_mary/2
    • Add columbus_day/2
    • Add all_saints_day/2
    • Add independence_of_cartagena/2
    • Add co_shift_date/3 to assist other functions
  • For Holidefs.DateCalculator:
    • Add to_nearest_monday_after/1
• Add custom exceptions
• Refactor build/3 and supporting functions
  • Some rules failed to build because their maps didn't match the clauses in build/3.
  • Added week!/1 for validating weeks
  • Added weekday!/1 for validating weekdays as well as converting Ruby's Sunday value (0) to Elixir's Sunday value (7) so that manual edits of the definition files are no longer necessary
  • Changed function_from_name/1 to function_from_name!/1 and raise a FunctionNotDefinedError when the function isn't available
  • Added fall-through cases for function_from_name!/1
  • Tests check for the new exceptions and verify the Ruby week day gets converted properly
• Add the ability supply a :deps argument to load!/3
  • When :deps is supplied in the third argument, we use the holiday definitions from the deps path instead of the priv directory.
• Format and apply credo suggestions

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