Update Flutter SDK to add offline support

[stnguyen90]

What does this PR do?

This is generated from Appwrite.

Test Plan

Manual:

• Android
  • I was able to queue write operations successfully while offline.
• iOS
  • I was able to queue write operations successfully while offline
  • I tested by turning wifi on my mac off, making updates, and then turning wifi on again. I had to initiate another API call, then then the write queued was processed as expected.
• Web
  • I was able to queue write operations successfully while offline
  • I tested by using the chrome dev tools to throttle my network to offline, making updates, and then turning off the throttle. The write queue was processed as soon as i disabled throttling.
• MacOS
  • I was able to queue write operations successfully while offline
  • I tested by turning wifi off, making updates, and then turning wifi on again. The write queue was processed as soon as i enabled wifi again.
• Linux
  • I was able to queue write operations successfully while offline
  • I tested by turning wifi off, making updates, and then turning wifi on again. The write queue was processed as soon as i enabled wifi again.
  • some linux packages are required
• Windows
  • I was able to queue write operations successfully while offline
  • I tested by turning wifi off, making updates, and then turning wifi on again. The write queue was processed as soon as i enabled wifi again.
  • sqlite3.dll is required

Related PRs and Issues

Appwrite PR:

• Prepare Flutter SDK release appwrite#5227

Previous SDK Generator PRs:

• Update Flutter SDK to add offline support sdk-generator#618
• Fix url used for checking offline status sdk-generator#627
• Ensure offline support works in linux sdk-generator#629

Have you read the Contributing Guidelines on issues?

(Write your answer here.)

[Sun3]

Any updates on current progress? I sure would love to see offline sync added.

Thanks.