Add terminal payment extension.

[haskelash-shopify]

WHY are these changes introduced?

Part of issue https://github.com/shop/issues-retail-on-payments-platform/issues/51

RPP is no longer just enabling cloud terminals, but local terminals as well. Because of this we're renaming the extension to the more general terminal_payment_extension.

WHAT is this pull request doing?

Rename extension spec and relevant files

How to test your changes?

Tophatting instructions can be found in this doc.

Post-release steps

The extensions in the bogus app and Adyen app will need to be renamed as well.

Measuring impact

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

• [x] 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

• [x] I've considered possible cross-platform impacts (Mac, Linux, Windows)
• [x] I've considered possible documentation changes

[github-actions[bot]]

Coverage report

St.:grey_question:	Category	Percentage	Covered / Total
🟡	Statements	76.61% (-0.01% 🔻)	9587/12514
🟡	Branches	71.87% (-0.01% 🔻)	4727/6577
🟡	Functions	76.53% (-0.02% 🔻)	2485/3247
🟡	Lines	77.12% (-0.01% 🔻)	9060/11748

Show new covered files 🐣

St.:grey_question:	File	Statements	Branches	Functions	Lines
🟡	... / terminal_payments_app_extension_schema.ts	66.67%	100%	0%	66.67%

Show files with reduced coverage 🔻

St.:grey_question:	File	Statements	Branches	Functions	Lines
🔴	... / payments_app_extension.ts	50% (-4.55% 🔻)	14.29% (-2.38% 🔻)	100%	50% (-4.55% 🔻)
🟢	... / ConcurrentOutput.tsx	98.36% (-1.64% 🔻)	88% (-4% 🔻)	100%	98.33% (-1.67% 🔻)

Test suite run success

2251 tests passing in 981 suites.

Report generated by 🧪jest coverage report action from 76a51643949620997b26b74e1cf1565d87681854

[github-actions[bot]]

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