[PBNTR-500] Currency Kit: Handling of null values

[nickamantia]

This PR adds a nullDisplay and null_display prop. The user can now choose how they want to display null value.

How to test? Steps to confirm the desired behavior:

1. Go to Currency kit
2. Scroll to last doc example

Checklist:

• LABELS Add a label: enhancement, bug, improvement, new kit, deprecated, or breaking. See Changelog & Labels for details.
• DEPLOY I have added the milano label to show I'm ready for a review.
• TESTS I have added test coverage to my code.

[github-actions]

🎉 Congratulations on creating an Alpha Version!

Your Alpha for Ruby Gems is 14.14.0.pre.alpha.pbntr500currencykithandlingofnullvalues6275

Your Alpha for NPM is 14.14.0-alpha.pbntr500currencykithandlingofnullvalues6275

[nidaqg]

General question @nickamantia , do you think we need to account for emphasized, light and bold variants? If they are using this null as a value within a table, my assumption is they would want consistency in the display, so if the rest of the values are light, they'll want this to be light as well?

We can also always only account for whatever the default is for this kit and add follow ups to account for different variants. I would also reach out to a designer with these questions!

[nickamantia]

General question @nickamantia , do you think we need to account for emphasized, light and bold variants? If they are using this null as a value within a table, my assumption is they would want consistency in the display, so if the rest of the values are light, they'll want this to be light as well?

We can also always only account for whatever the default is for this kit and add follow ups to account for different variants. I would also reach out to a designer with these questions!

I 100% think we should make sure this works with all variants. That is an excellent point.

[github-actions]

🎉 Congratulations on creating an Alpha Version!

Your Alpha for Ruby Gems is 14.14.0.pre.alpha.pbntr500currencykithandlingofnullvalues6311

Your Alpha for NPM is 14.14.0-alpha.pbntr500currencykithandlingofnullvalues6311