feat: add ScyllaDB adapter support

- Add ScyllaDB adapter class with full database operations support

- Add comprehensive test suite for ScyllaDB adapter

- Add ScyllaDB services to docker-compose.yml

- Update README with ScyllaDB connection example and specs

Author: tinkerer-shubh

README.md

@@ -55,6 +55,7 @@ Below is a list of supported databases, and their compatibly tested versions alo
 | Postgres | ✅      | 13.0    |
 | MongoDB  | ✅      | 5.0     |
 | SQLite   | ✅      | 3.38    |
+| ScyllaDB | ✅      | 5.2     |
 
 ` ✅  - supported `
 
@@ -82,6 +83,16 @@ Below is a list of supported databases, and their compatibly tested versions alo
 - String max size is 2147483647 characters 
 - Integer max size is 4294967295 
 
+#### ScyllaDB
+- ID max size can be 255 bytes
+- ID can only contain [^A-Za-z0-9] and symbols `_` `-`
+- Document can have unrestricted size
+- Collection can have unrestricted amount of attributes
+- Collection can have unrestricted amount of indexes
+- Index value can have unrestricted size
+- String max size is unrestricted
+- Integer max size is 2^63 - 1
+
 ## Usage
 
 ### Connecting to a Database 
@@ -207,6 +218,32 @@ $cache = new Cache(new Memory()); // or use any cache adapter you wish
 $database = new Database(new SQLite($pdo), $cache);
 ```
 
+#### ScyllaDB
+
+```php
+require_once __DIR__ . '/vendor/autoload.php';
+
+use PDO;
+use Utopia\Database\Database;
+use Utopia\Cache\Cache;
+use Utopia\Cache\Adapter\Memory;
+use Utopia\Database\Adapter\ScyllaDB;
+
+$dbHost = 'scylladb';
+$dbPort = '9042';
+$dbUser = 'root';
+$dbPass = 'password';
+
+$pdo = new PDO("scylla:host={$dbHost};port={$dbPort}", $dbUser, $dbPass, ScyllaDB::getPDOAttributes());
+
+$cache = new Cache(new Memory());
+$database = new Database(new ScyllaDB($pdo), $cache);
+
+$database
+    ->setDatabase('myapp')
+    ->setNamespace('myapp_ns');
+```
+
 #### MongoDB
 
 ```php

docker-compose.yml

@@ -130,5 +130,38 @@ services:
     networks:
       - database
 
+  scylladb:
+    image: scylladb/scylla:5.2
+    container_name: utopia-scylladb
+    restart: unless-stopped
+    networks:
+      - database
+    ports:
+      - "8710:9042"
+    command: --smp 1 --memory 750M --overprovisioned 1 --api-address 0.0.0.0
+    healthcheck:
+      test: ["CMD-SHELL", "nodetool status"]
+      interval: 30s
+      timeout: 10s
+      retries: 5
+
+  scylladb-mirror:
+    image: scylladb/scylla:5.2
+    container_name: utopia-scylladb-mirror
+    restart: unless-stopped
+    networks:
+      - database
+    ports:
+      - "8711:9042"
+    command: --smp 1 --memory 750M --overprovisioned 1 --api-address 0.0.0.0
+    healthcheck:
+      test: ["CMD-SHELL", "nodetool status"]
+      interval: 30s
+      timeout: 10s
+      retries: 5
+
 networks:
   database:
+
+volumes:
+  appwrite-scylladb: