feat: adds market insights logic

[zone-live]

Explanation

Extended AiDigestController with fetchMarketInsights and clearMarketInsights actions that search for AI generated market insights by asset. The service currently returns mock data but when the API is live, the real fetch to it will be added.

References

Checklist

• I've updated the test suite for new or updated code as appropriate
• I've updated documentation (JSDoc, Markdown, etc.) for new or updated code as appropriate
• I've communicated my changes to consumers by updating changelogs for packages I've changed
• I've introduced breaking changes in this PR and have prepared draft pull requests for clients and consumer packages to resolve them

[zone-live]

@metamaskbot publish-preview

[github-actions]

Preview builds have been published. See these instructions for more information about preview builds.

Expand for full list of packages and versions.

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