feat: add parsePrepTime item helper

[allensquare]

Add a new parsePrepTime helper to deal with parsing the item preparation time duration string. This outputs a ItemPrepTime object:

{
	value: value,
	unit: unit,
	is_time: isTime,
}

[github-actions]

size-limit report 📦

Path	Size
lib/index.js	6.18 KB (+2.33% 🔺)
lib/index.umd.cjs	6.33 KB (+2.21% 🔺)

[github-actions]

📊 Package size report   2%↑

File	Before	After
lib/helpers/item.d.ts	3.2 kB	16%↑3.7 kB
lib/index.js	38.4 kB	3%↑39.3 kB
lib/index.umd.cjs	18.6 kB	2%↑19.1 kB
lib/types/helpers/item/index.d.ts	3.1 kB	3%↑3.2 kB
Total (Includes all files)	114.8 kB	2%↑116.8 kB
Tarball size	29.6 kB	3%↑30.4 kB

Unchanged files

File	Size
lib/api/cart.d.ts	4.6 kB
lib/api/customers.d.ts	1.3 kB
lib/api/orders.d.ts	782 B
lib/api/places.d.ts	1.3 kB
lib/api/resources.d.ts	1.3 kB
lib/api/template.d.ts	686 B
lib/clients/buyers.d.ts	236 B
lib/helpers/auth.d.ts	239 B
lib/helpers/cookies.d.ts	71 B
lib/helpers/datetime.d.ts	2.1 kB
lib/helpers/location.d.ts	3.9 kB
lib/helpers/money.d.ts	1.5 kB
lib/index.d.ts	859 B
lib/types/api/cart/index.d.ts	11.5 kB
lib/types/api/cart/private.types.d.ts	778 B
lib/types/api/customers/index.d.ts	427 B
lib/types/api/orders/index.d.ts	346 B
lib/types/api/places/index.d.ts	1.9 kB
lib/types/api/resources/index.d.ts	4.2 kB
lib/types/api/resources/private.types.d.ts	60 B
lib/types/api/template/index.d.ts	808 B
lib/types/clients/buyers.private.d.ts	365 B
lib/types/helpers/datetime/index.d.ts	3.9 kB
lib/types/helpers/location/index.d.ts	3.4 kB
lib/types/helpers/money/index.d.ts	92 B
lib/types/looseobject.d.ts	78 B
LICENSE	1.1 kB
package.json	2.1 kB
README.md	1.6 kB

_{🤖 This report was automatically generated by pkg-size-action}

[github-actions]

🎉 This PR is included in version 1.0.0-alpha.4 🎉

The release is available on GitHub release

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