feat(matomocloud): Improve cookieless tracking fallback

[ambroisemaupate]

• Added tarteaucitron.user.matomoCookieLessFallback boolean parameter to allow tracking without cookies in fallback. For the moment, Matomo does not track anything unless consent has been given. \ Related to #1085 #1028
• Added tarteaucitron.user.matomoCustomCookieDomain string parameter to change setCookieDomain option (https://developer.matomo.org/guides/tracking-javascript-guide#tracking-one-domain-and-its-subdomains-in-the-same-website)
• Added tarteaucitron.user.matomoWebsiteDomains array<string> parameter to declare same-site domains list to setDomains option
• Added tarteaucitron.user.matomoFallbackId number parameter to use a different Site ID for fallback tracking. Website may use a different Matomo site to collect cookie-less statistics. If so, we add the fallback Site ID with addTracker option when consent is given.

This PR should not break compatibility with existing matomocloud service. These features are optional and only triggered when defining parameters above.

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[AmauriC]

Hi,

Thanks for your contribution and sorry for the delay to reply.

On the pro version, this is not possible to set as undefined a string option, so for example tarteaucitron.user.matomoCustomCookieDomain and tarteaucitron.user.matomoFallbackId will be empty and it will break the logic.

Can you change the check from undefined to empty string?

Thanks!

[ambroisemaupate]

I've kept tests against undefined and added tests against empty string as requested.