Adds support for collecting retail delivery fees

Yang baru

This change has two parts:

• Adds retail_delivery_fee to the list of possible enum values for tax_type in the Tax Rate resource. This makes it possible to represent retail delivery fees in Minnesota and Colorado.
• Extends tax_rate_details for Tax Calculations to represent flat amount tax rates.

Dampak

Lets you accurately collect taxes when selling tangible personal property in Minnesota and Colorado.

Perubahan

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