Update Flutter SDK to add offline support

[stnguyen90]

What does this PR do?

This is generated from Appwrite.

Test Plan

Manual:

• [x] Android
  • I was able to queue write operations successfully while offline.
• [x] 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.
• [x] 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.
• [x] 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.
• [x] 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
• [x] 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:

• https://github.com/appwrite/appwrite/pull/5227

Previous SDK Generator PRs:

• https://github.com/appwrite/sdk-generator/pull/618
• https://github.com/appwrite/sdk-generator/pull/627
• https://github.com/appwrite/sdk-generator/pull/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.