feat: Flutter SDK update for version 21.1.0

[ArnabChatterjee20k]

This PR contains updates to the Flutter SDK for version 21.1.0.

Summary by CodeRabbit

Release Notes

• Documentation

  • Removed code examples for payment method and API key management operations.

• Chores

  • Removed payment method management capabilities including create, retrieve, update, and delete operations from the Account service.
  • Removed API key management capabilities including create, retrieve, update, delete, and list operations from the Account service.

[coderabbitai]

Walkthrough

This pull request removes API keys and payment methods functionality from the Appwrite Dart SDK. Changes include: deletion of Account service methods for keys and payment methods; removal of related model classes and part directives (Key, KeyList, PaymentMethod, PaymentMethodList); deletion of the Scopes enum and its part directive; removal of many documentation examples for keys and payment methods; and removal of unit tests covering those models and service methods.

Estimated code review effort

🎯 4 (Complex) | ⏱️ ~45 minutes

🚥 Pre-merge checks | ✅ 3 | ❌ 1

❌ Failed checks (1 warning)

Check name	Status	Explanation	Resolution
Merge Conflict Detection	⚠️ Warning	❌ Merge conflicts detected (4 files): ⚔️ lib/enums.dart (content) ⚔️ lib/models.dart (content) ⚔️ lib/services/account.dart (content) ⚔️ test/services/account_test.dart (content) These conflicts must be resolved before merging into main.	Resolve conflicts locally and push changes to this branch.

✅ Passed checks (3 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title accurately describes the main change: a version update to the Flutter SDK for 21.1.0. The changeset removes multiple API methods, models, examples, and tests related to account keys and payment methods as part of this SDK update.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.

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✨ Finishing touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch dev

⚔️ Resolve merge conflicts (beta)

• Auto-commit resolved conflicts to branch dev
• Create stacked PR with resolved conflicts
• Post resolved changes as copyable diffs in a comment

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