chore: mark multi-provider packages as deprecated

[jonathannorris]

Summary

Mark @openfeature/multi-provider and @openfeature/multi-provider-web packages as deprecated.

The Multi-Provider functionality is now included directly in the main OpenFeature SDKs:

• @openfeature/server-sdk
• @openfeature/web-sdk

[gemini-code-assist]

Summary of Changes

Hello @jonathannorris, 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 formally deprecates the standalone multi-provider packages for both web and server environments. This change streamlines the OpenFeature ecosystem by consolidating the multi-provider functionality directly into the respective main SDKs, guiding users towards a more integrated and simplified approach for managing multiple feature flag providers.

Highlights

• Package Deprecation: The @openfeature/multi-provider and @openfeature/multi-provider-web packages have been formally marked as deprecated.
• Functionality Consolidation: The multi-provider functionality previously offered by these standalone packages is now directly integrated into the main @openfeature/server-sdk and @openfeature/web-sdk.

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[gemini-code-assist]

Code Review

This pull request correctly marks the @openfeature/multi-provider and @openfeature/multi-provider-web packages as deprecated by adding a deprecated field to their respective package.json files and including a deprecation notice in their READMEs. The changes are straightforward and align with the goal of migrating users to the main SDKs. I've suggested minor improvements to the README files to include direct links to the relevant SDK documentation, which will help users with the migration process.