Currency input mask should be configurable

Problem/Motivation

The currency format is currently hardcoded to USD within the codebase, which isn't ideal for non-US based websites.

Steps to reproduce

Use a calculation with a currency input mask.

Proposed resolution

The parameters used for the Intl.NumberFormat calls should be configurable entirely by the site builder via data attributes, allowing them to preprocess and alter the parameters to match their specific use case.

Remaining tasks

Discuss/Implement feature.

User interface changes

TBD