Values Store initial implementation

[akremenetsky]

There main entities in VS:

• Profiles. Allow to adaptate installation for various environments such as local development, stage, production.
• Values. Allow to specify values of different types such as int, float, list, object, string, bool.
• Variables. The entities with internal logic to calculate value based on profiles or values.

Support of profiles as on the global scope as the element scope. Additional actions in EM API to set and clear profiles.

Closes #163

[gemini-code-assist]

Summary of Changes

Hello @akremenetsky, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request introduces the foundational "Values Store" system, designed to provide a flexible and dynamic way to manage configuration values across different environments and elements. It establishes core entities like Profiles for environment adaptation, Values for typed data storage, and Variables for intelligent value resolution. The changes integrate this new system into the existing API and service architecture, allowing elements to be associated with profiles and enabling variables to automatically determine their values based on these profiles or explicit selections.

Highlights

• Values Store (VS) Introduction: Implements the core components of the Values Store, including Profiles, Values, and Variables, to manage dynamic configurations and environment adaptation.
• API Endpoints: New API routes (/v1/vs/) are exposed for interacting with Profiles, Variables, and Values, allowing for CRUD operations and specific actions like profile activation and variable value selection.
• Element-Profile Integration: The Element model now includes a profile relationship, enabling elements to be associated with specific Values Store profiles. New API actions (set_profile, clear_profile) are added to the Element Manager (EM) API to manage this association.
• Dynamic Variable Resolution: The VSBuilderService is introduced to dynamically calculate and set variable values based on defined setters (ProfileVariableSetter or SelectorVariableSetter), considering both global and element-specific profiles.
• Database Schema: New database tables (vs_profiles, vs_variables, vs_values) are created to persist the Values Store entities, along with an update to em_elements to include a profile foreign key.

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Code Review

This pull request introduces the Values Store (VS) feature, which includes profiles, values, and variables to adapt installations for various environments. The changes span multiple files, adding new models, API endpoints, and builder services to support this functionality. The review focuses on identifying potential issues related to correctness and maintainability, particularly in the new code related to VS.