* Add MarketingRecommendations feature.
The code here is based on other feature with default fallbacks and with data source poller, e.g. see payment gateway suggestions.
* Use MarketingRecommendations feature in API.
* Add spec_key for MarketingRecommendationsDataSourcePoller.
If we don't specify it, the default is `id`, which is not used in our recommendation data, and this will cause things not to work as expected.
* Recursively convert object to array.
This is because all the subsequent functions work with arrays, not objects.
* Make recommended marketing tools and coupons use MarketingRecommendationsInit.
This is so that recommended channels, tools, and coupons make use of the same transient data with data source poller.
* Add changelog.
* Fix PHP lint issues.
* Add doc comment to fix lint error.
* Fix tests in MarketingRecommendationsTest.
* Replace recommendations.json file with generated data in DefaultMarketingRecommendations.
This is to have i18n support.
* Add icons for fallback marketing recommendations.
* Fix PHP linting issue.
* Fix linting issue.
* Fix failing tests with PHP 8.0.
* Remove unused replaced code in MarketingSpecs.
* Remove unneeded false check.
This is because `is_array` would return `false` when `false` is being passed as the argument.
Co-authored-by: Bartosz Budzanowski <bartosz.budzanowski@automattic.com>
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Co-authored-by: Bartosz Budzanowski <bartosz.budzanowski@automattic.com>
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