Commits on Aug 17, 2024

1. Add support for WebDX Groups, Feature-Group Mappings & Group Descendants …

   **Description:**
   
   This PR introduces the foundational schema and data access layer for managing WebDX Groups and their associations with Web Features in Spanner.
   
   **Key Changes**
   
   * **Schema:**
      * Created the `WebDXGroups` table to store group metadata.
      * Created the `WebFeatureGroups` table to map web features to their associated groups.
      * Created the `WebDXGroupDescendants` to include the descendant group IDs for efficient querying
   
   * **Data Access Layer:**
      * Implemented `UpsertGroup` and `GetGroupIDFromGroupKey` methods in the `Client` struct to interact with the `WebDXGroups` table.
      * Implemented `UpsertWebFeatureGroup` to manage feature-group mappings in the `WebFeatureGroups` table.
      * Implemeneted `UpsertGroupDescendantInfo` to manage mappings of groups to all descendant groups.
      * Introduced helper structs and mappers (`WebFeatureGroup`, `groupSpannerMapper`, etc.) to facilitate data mapping and persistence.
   
   **Purpose**
   
   * Enables storing and retrieving information about WebDX Groups and their relationships with Web Features.
   * Lays the groundwork for future features that rely on group-based organization and filtering.
   * Optimizes queries for features associated with a group and its descendants by pre-calculating and storing descendant group IDs.
     * This is useful because if a user queries for a group, it should return the features belonging to children groups too.

   

   jcscottiii committed Aug 17, 2024
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