docs(changelog): enrich 5.7.3 with native SDK fixes and Flutter PRs

[kherembourg]

Summary

• Mirror the Purchasely React Native 5.7.3 release notes — iOS SDK 5.7.4, Android SDK 5.7.4 — with the full list of native bug fixes.
• Add Flutter-specific entries:
  • Native view rotation fix on iOS (fix(native-view): resolve nested view content loss after rotation #110)
  • New pub.dev publish workflow (Add publish workflow for pub.dev #109)

Test plan

• CHANGELOG.md renders correctly
• After merge: tag v5.7.3 to trigger the publish workflow

🤖 Generated with Claude Code

[greptile-apps]

Greptile Summary

This PR enriches the purchasely/CHANGELOG.md entry for version 5.7.3, replacing the three-line placeholder with detailed sections covering native SDK version ranges, Flutter-specific fixes, iOS/Android bug-fix lists, and an improvements note. The other two package changelogs (purchasely_google, purchasely_android_player) are intentionally left with their minimal auto-generated entries, which is consistent with those packages only tracking their respective SDK bumps.

Confidence Score: 5/5

Documentation-only change with no runtime impact; safe to merge.

Only CHANGELOG.md is modified; content is accurate (version ranges verified against neighbouring entries), formatting is consistent with the existing richer-entry precedent in 5.6.1/5.5.x, and no code paths are touched.

No files require special attention.

Important Files Changed

Filename	Overview
purchasely/CHANGELOG.md	5.7.3 entry enriched with structured sections; version ranges (iOS 5.7.2→5.7.4, Android 5.7.3→5.7.4) match surrounding changelog entries; "Full changelog" footer retained

Flowchart

%%{init: {'theme': 'neutral'}}%%
flowchart TD
    A[Merge PR #114\nEnriched CHANGELOG 5.7.3] --> B[Push tag v5.7.3]
    B --> C[publish.yml triggered\nvia tag push]
    C --> D{Validation}
    D -- pass --> E[Publish purchasely\nto pub.dev]
    D -- pass --> F[Publish purchasely_google\nto pub.dev]
    D -- pass --> G[Publish purchasely_android_player\nto pub.dev]
    D -- fail --> H[CI error / abort]

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[kherembourg]

Annulé — la release sera taguée directement sur main avec changelog dans la GitHub release.