New extension buyer consent capability

[joshlbaker]

WHY are these changes introduced?

Resolves: https://github.com/Shopify/checkout-web/issues/25433

This PR relates to the SMS Consent project being worked on in Checkout Extensibility.

WHAT is this pull request doing?

• Adds a new extension capability called collect_buyer_consent with it's own sub-capability/policy for sms_marketing.

• Note that email_marketing will be added in the future.

• Updates capability types to accept recursive typing for nested capabilities (new concept for this PR)
• Updates tests which confirms the following configuration works as expected

[extesnions.capabilities.collect_buyer_consent]
sms_marketing = true

and legacy config

[capabilities.collect_buyer_consent]
sms_marketing = true

How to test your changes?

Post-release steps

Measuring impact

How do we know this change was effective? Please choose one:

• n/a - this doesn't need measurement, e.g. a linting rule or a bug-fix
• Existing analytics will cater for this addition
• PR includes analytics changes to measure impact

Checklist

• I've considered possible cross-platform impacts (Mac, Linux, Windows)
• I've considered possible documentation changes
• I've made sure that any changes to dev or deploy have been reflected in the internal flowchart.

[github-actions]

Thanks for your contribution!

Depending on what you are working on, you may want to request a review from a Shopify team:

• Themes: @shopify/theme-code-tools
• UI extensions: @shopify/ui-extensions-cli
  • Checkout UI extensions: @shopify/checkout-ui-extensions-api-stewardship
• Hydrogen: @shopify/hydrogen
• Other: @shopify/cli-foundations

[github-actions]

Coverage report

St.❔	Category	Percentage	Covered / Total
🟡	Statements	73.87%	6047/8186
🟡	Branches	71.09% (+0.02% 🔼)	2953/4154
🟡	Functions	72.3%	1537/2126
🟡	Lines	75.21%	5739/7631

Show files with reduced coverage 🔻

St.❔	File	Statements	Branches	Functions	Lines
🟢	... / function.ts	86.36%	85% (-1.36% 🔻)	83.33%	86.36%
🟡	... / utilities.ts	57.89% (-2.11% 🔻)	69.23%	33.33%	68.75% (-1.84% 🔻)

Test suite run success

1430 tests passing in 669 suites.

Report generated by 🧪jest coverage report action from 075ae2c

[joshlbaker]

/shipit