Add term meta setting to store term-level RRM settings

[nfmohit]

Feature Description

As part of RRM Phase 2, the WordPress taxonomy term screens will allow users to override the snippet configuration at the taxonomy term level. To facilitate this, a term meta setting should be added to store the term-level configuration.

A Modules\Reader_Revenue_Manager\Term_Product_ID class extending the Core\Storage\Term_Meta_Setting class should be created to register a term meta setting to store the taxonomy term-level snippet options. It should hold an empty string as the value by default. The meta key can be googlesitekit_rrm_{Publication ID}:productID.

• See the relevant section in the design doc.

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Acceptance criteria

• When the rrmModuleV2 feature flag is enabled:
  • A new term meta setting should be registered using the new term meta infrastructure that will store the per-term-level snippet configuration for Reader Revenue Manager.
  • The meta key should include the publication ID so that it can be uniquely identified when the connected publication changes.
  • The meta value by default should be an empty string, and it should only accept a string as the value.

Implementation Brief

• Create a class Term_Product_ID inside includes/Modules/Reader_Revenue_Manager.

  • It should accept the instance of Core\Storage\Term_Meta and the publication ID in it's constructor. The publication ID can be assigned to a private class property which would then be utilised to form the meta key.
  • It extends Google\Site_Kit\Core\Storage\Term_Meta_Setting class (added in Add term meta infrastructure #9949).
  • Override the get_meta_key which should return googlesitekit_rrm_{publication_id}:productID. Taking publication_id from the value passed to the contructor.

• In includes/Modules/Reader_Revenue_Manager.php

  • In register method, check if rrmModuleV2 feature is enabled using Feature_Flags::enabled( 'rrmModuleV2' ). If feature is enabled and module is connected, do the following.
    • Instantiate Core\Storage\Term_Meta class.
    • Instantiate Term_Product_ID and pass instance of Core\Storage\Post_Meta and the publication ID to it's constructor.
    • Call register method of the Term_Product_ID class.

TODO: Complete based on the implementation of the Term_Meta class in #9949 and its methods.

Test Coverage

• Write tests for Test_Product_ID class.
• Fix any failing tests.

QA Brief

Changelog entry