feat: SDK update for version 8.2.0

[ChiragAgg5k]

This PR contains updates to the SDK for version 8.2.0.

What's Changed

• Added: optional interval parameter on functions.create and functions.update to run a function every N minutes
• Added: interval on the Function model and functionsIntervalMinimum on the BillingPlan model

[hansi-codes]

🟢 Tier S · Ready to merge

No actionable defects were found in the reviewed changes.

Updates the .NET SDK package and client identification to version 8.2.0. Adds interval support to function create/update requests and the Function model, and exposes functionsIntervalMinimum on BillingPlan. Updates the changelog, README installation examples, and function API examples.

Verdict	New comments	Fixed	Still open
✅ Approved	0	0	0

📂 Walkthrough · 9

File	Change
Appwrite/Appwrite.csproj	Bumps the NuGet package version to 8.2.0.
Appwrite/Client.cs	Updates the SDK version in request headers.
Appwrite/Models/BillingPlan.cs	Adds functionsIntervalMinimum to BillingPlan parsing and serialization.
Appwrite/Models/Function.cs	Adds the nullable interval property to Function parsing and serialization.
Appwrite/Services/Functions.cs	Adds the optional interval parameter to Create and Update requests.
CHANGELOG.md	Documents the 8.2.0 SDK additions.
README.md	Updates installation examples to version 8.2.0.
docs/examples/functions/create.md	Shows interval in the function creation example.
docs/examples/functions/update.md	Shows interval in the function update example.

---

_{Reviewed 8b988e1 · Details · Comment @hansi-codes review to re-run, or mention @hansi-codes with a question.}

[hansi-codes]

🟢 Tier S · Looks good to merge. Summary