docs: add v5.8.0 package updates

[onesignal-deploy]

Release v5.8.0

🐛 Bug Fixes

• fix: omit include_unsubscribed from requests when unset

📚 Docs

• docs: [SDK-4800] add AGENTS.md agent entry point to each SDK
• docs: [SDK-4819] fix non-compiling Rust README quick-start
• docs: [SDK-4800] fix AGENTS.md Rust import, retry base-delay, absolute README links
• docs: [SDK-4819] fix Rust README email/SMS target_channel field
• docs: [SDK-4839] add realistic example values to user/segment/subscription schemas
• docs: [SDK-4842] standardize app-id placeholder, add headings to all push examples, note dateutil dependency
• docs: [SDK-4842] add example values for Purchase, Subscription id/carrier/web keys, and PropertiesObject.ip
• docs: [SDK-4842] add example values for Filter fields and IdentityObject entries
• docs: [SDK-4842] render valid Ruby in model doc examples and drop asymmetric identity sample

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Generated from OneSignal/api-client-libraries@1d424a7...c6344eb.

[onesignal-deploy]

Superseded by v5.9.0 release.