Prepared Seperation of Database components for future multi provider support

Jellyfin.Server.Implementations/DbConfiguration/DatabaseConfigurationFactory.cs

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+using System;
+using System.Collections.Generic;
+using MediaBrowser.Common.Configuration;
+
+namespace Jellyfin.Server.Implementations.DatabaseConfiguration;
+
+/// <summary>
+/// Factory for constructing a database configuration.
+/// </summary>
+public class DatabaseConfigurationFactory : IConfigurationFactory
+{
+    /// <inheritdoc/>
+    public IEnumerable<ConfigurationStore> GetConfigurations()
+    {
+        yield return new DatabaseConfigurationStore();
+    }
+}

Jellyfin.Server.Implementations/DbConfiguration/DatabaseConfigurationOptions.cs

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+using System;
+
+namespace Jellyfin.Server.Implementations.DatabaseConfiguration;
+
+/// <summary>
+/// Options to configure jellyfins managed database.
+/// </summary>
+public class DatabaseConfigurationOptions
+{
+    /// <summary>
+    /// Gets or Sets the type of database jellyfin should use.
+    /// </summary>
+    public required string DatabaseType { get; set; }
+}

Jellyfin.Server.Implementations/DbConfiguration/DatabaseConfigurationStore.cs

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+using System;
+using System.Collections.Generic;
+using MediaBrowser.Common.Configuration;
+
+namespace Jellyfin.Server.Implementations.DatabaseConfiguration;
+
+/// <summary>
+/// A configuration that stores database related settings.
+/// </summary>
+public class DatabaseConfigurationStore : ConfigurationStore
+{
+    /// <summary>
+    /// The name of the configuration in the storage.
+    /// </summary>
+    public const string StoreKey = "database";
+
+    /// <summary>
+    /// Initializes a new instance of the <see cref="DatabaseConfigurationStore"/> class.
+    /// </summary>
+    public DatabaseConfigurationStore()
+    {
+        ConfigurationType = typeof(DatabaseConfigurationOptions);
+        Key = StoreKey;
+    }
+}