feat: Android SDK update for version 23.1.0

[ChiragAgg5k]

This PR contains updates to the Android SDK for version 23.1.0.

[greptile-apps]

Greptile Summary

This PR bumps the Android SDK to version 23.1.0, targeting Appwrite API 1.9.1. Changes include adding the X OAuth provider enum value, a new userType field on the Log model, expanded TTL KDoc in Databases and TablesDB, and the corresponding version header/badge updates.

Confidence Score: 5/5

Safe to merge — all changes are a clean SDK version bump with no logic errors or security concerns.

Only finding is a P2 suggestion to make the new userType field nullable for graceful backward compatibility; no P0/P1 issues exist. All version numbers are internally consistent (SDK, header, README, CHANGELOG), the new enum value is correctly placed, and the documentation improvements are accurate.

library/src/main/java/io/appwrite/models/Log.kt — minor nullability consideration for userType

Important Files Changed

Filename	Overview
CHANGELOG.md	New 23.1.0 entry accurately documents all changes in this PR
README.md	Version badge and dependency examples updated from 23.0.0 to 23.1.0 and API version from 1.9.0 to 1.9.1
library/src/main/java/io/appwrite/Client.kt	SDK version and x-appwrite-response-format header bumped to 23.1.0 and 1.9.1 respectively
library/src/main/java/io/appwrite/enums/OAuthProvider.kt	X OAuth provider added in correct alphabetical position between WORDPRESS and YAHOO
library/src/main/java/io/appwrite/models/Log.kt	userType String field added; non-nullable type is consistent with existing fields but could throw ClassCastException against older server responses
library/src/main/java/io/appwrite/services/Account.kt	KDoc provider lists updated to include x in both OAuth method overloads
library/src/main/java/io/appwrite/services/Databases.kt	TTL parameter KDoc expanded with detailed caching behaviour (invalidation, key composition, stale-data trade-off)
library/src/main/java/io/appwrite/services/TablesDB.kt	TTL parameter KDoc expanded identically to Databases.kt with table-specific wording (columns/rows)

_{Reviews (1): Last reviewed commit: "chore: update Android SDK to 23.1.0" | Re-trigger Greptile}

[greptile-apps]

userType nullability on older server responses

map["userType"] returns null if the key is absent, and null as String throws a kotlin.TypeCastException at runtime. Every other field in this model follows the same non-nullable pattern, so this is consistent — but userType is a newly introduced field that an Appwrite server older than 1.9.1 won't include in its response. Declaring it as String? would let apps that connect to a not-yet-upgraded backend degrade gracefully instead of crashing.

Suggested change

	userType = map["userType"] as String,
	userType = map["userType"] as? String ?: "",