Support basic auth when fetching nonce with site credentials

[JorgeMucientes]

Closes: WOOMOB-1702

Description

Adds support for basic auth when fetching site nonce using site credentials

Test Steps

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• I have considered if this change warrants release notes and have added them to RELEASE-NOTES.txt if necessary. Use the "[Internal]" label for non-user-facing changes.

[dangermattic]

	1 Message
📖	This PR is still a Draft: some checks will be skipped.

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[wpmobilebot]

📲 You can test the changes from this Pull Request in WooCommerce-Wear Android by scanning the QR code below to install the corresponding build.

	App Name	WooCommerce-Wear Android
	Platform	⌚️ Wear OS
	Flavor	Jalapeno
	Build Type	Debug
	Commit	ac7d739
	Direct Download	woocommerce-wear-prototype-build-pr14942-ac7d739.apk

[wpmobilebot]

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[wpmobilebot]

📲 You can test the changes from this Pull Request in WooCommerce Android by scanning the QR code below to install the corresponding build.

	App Name	WooCommerce Android
	Platform	📱 Mobile
	Flavor	Jalapeno
	Build Type	Debug
	Commit	ac7d739
	Direct Download	woocommerce-prototype-build-pr14942-ac7d739.apk

[wzieba]

👋 @JorgeMucientes I know it's only a draft, but just in case if it'll be helpful I'd like to share a few comments:

• HTTP Basic Auth can be authorized with different credentials than WP. They are indeed sometimes the same (like in Pressable) but that's not actually a rule/requirement.
• We have a dedicated flow for HTTP Basic Auth with a different screen etc. - maybe we can use it. See:

woocommerce-android/libs/login/src/main/java/org/wordpress/android/login/LoginSiteAddressFragment.java

Line 346 in 131ff2f

private void askForHttpAuthCredentials(@NonNull final String url, int messageId) {

and the remaining flow that starts there.