feat: PHP SDK update for version 21.0.0

[ChiragAgg5k]

This PR contains updates to the PHP SDK for version 21.0.0.

[coderabbitai]

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ℹ️ Review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro

Run ID: 414b2f05-c1d5-49c4-8ca2-0549f13feaa2

📥 Commits

Reviewing files that changed from the base of the PR and between 55dc795 and 954a2ed.

📒 Files selected for processing (49)

• CHANGELOG.md
• README.md
• docs/examples/databases/create-index.md
• docs/examples/functions/create.md
• docs/examples/functions/update.md
• docs/examples/project/create-variable.md
• docs/examples/project/delete-variable.md
• docs/examples/project/get-variable.md
• docs/examples/project/list-variables.md
• docs/examples/project/update-variable.md
• docs/examples/sites/create.md
• docs/examples/sites/update.md
• docs/examples/tablesdb/create-index.md
• docs/examples/users/update-impersonator.md
• docs/examples/webhooks/create.md
• docs/examples/webhooks/delete.md
• docs/examples/webhooks/get.md
• docs/examples/webhooks/list.md
• docs/examples/webhooks/update-signature.md
• docs/examples/webhooks/update.md
• docs/functions.md
• docs/health.md
• docs/project.md
• docs/sites.md
• docs/users.md
• docs/webhooks.md
• src/Appwrite/Client.php
• src/Appwrite/Enums/BackupServices.php
• src/Appwrite/Enums/DatabaseType.php
• src/Appwrite/Enums/DatabasesIndexType.php
• src/Appwrite/Enums/Scopes.php
• src/Appwrite/Enums/TablesDBIndexType.php
• src/Appwrite/Enums/TemplateReferenceType.php
• src/Appwrite/Services/Databases.php
• src/Appwrite/Services/Functions.php
• src/Appwrite/Services/Health.php
• src/Appwrite/Services/Project.php
• src/Appwrite/Services/Sites.php
• src/Appwrite/Services/TablesDB.php
• src/Appwrite/Services/Users.php
• src/Appwrite/Services/Webhooks.php
• tests/Appwrite/Services/DatabasesTest.php
• tests/Appwrite/Services/FunctionsTest.php
• tests/Appwrite/Services/HealthTest.php
• tests/Appwrite/Services/ProjectTest.php
• tests/Appwrite/Services/SitesTest.php
• tests/Appwrite/Services/TablesDBTest.php
• tests/Appwrite/Services/UsersTest.php
• tests/Appwrite/Services/WebhooksTest.php

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch dev

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