Add Region#tax_type accessor, cut v1.14.0

[DominiqueFlaaa]

What are you trying to accomplish?

Region ymls contain data on the zone tax_types

worldwide/db/data/regions/CA.yml

Lines 121 to 122 in dc40ce8

	tax_name: HST
	tax_type: harmonized

This PR makes the tax type available via the Region object.

Also cuts version 1.14.0.

What approach did you choose and why?

Added region territory accessor for tax_type. Unlike tax_name and tax_rate, the tax_type is only defined on the territory or zone level.

What should reviewers focus on?

...

The impact of these changes

 ❯ bin/console
irb(main):001> ca = Worldwide.region(code: "CA")
=> #<Worldwide::Region:26800 @alpha_three="CAN", @building_number_required=true, @currency=#<Worldwide::Currency:0x00000001391edf40 @currency_code="CAD", @numeric_code=124>, @example_city=nil, @example_city_zip=nil, @example_address={"address1"=>"1 ...
irb(main):002> ca.zone(code: "ON").tax_type
=> "harmonized"
irb(main):003> Worldwide.region(code: "US").zone(code: "CA").tax_type
=> nil

on a country-level region, returns nil

irb(main):001> ca = Worldwide.region(code:'CA')
=> #<Worldwide::Region:28280 @alpha_three="CAN", @building_number_required=true, @currency=#<Worldwide::Currency:0x000000011ea12538 @currency_code="CAD", @numeric_code=124>, @example_city=nil, @example_city_zip=nil, @example_address={"address1"=>"1 Sussex Drive", ...
irb(main):002> ca.tax_type
=> nil

Checklist

• I have added a CHANGELOG entry for this change (or determined that it isn't needed)

[DominiqueFlaaa]

Updated to cut a new minor version.