general refactor, move more classes under Database namespace

src/Database/Contracts/ManagesDatabaseUsers.php

@@ -0,0 +1,19 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Stancl\Tenancy\Database\Contracts;
+
+use Stancl\Tenancy\Database\DatabaseConfig;
+
+interface ManagesDatabaseUsers extends TenantDatabaseManager
+{
+    /** Create a database user. */
+    public function createUser(DatabaseConfig $databaseConfig): bool;
+
+    /** Delete a database user. */
+    public function deleteUser(DatabaseConfig $databaseConfig): bool;
+
+    /** Does a database user exist? */
+    public function userExists(string $username): bool;
+}

src/Database/Contracts/TenantDatabaseManager.php

@@ -0,0 +1,29 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Stancl\Tenancy\Database\Contracts;
+
+use Stancl\Tenancy\Database\Exceptions\NoConnectionSetException;
+
+interface TenantDatabaseManager
+{
+    /** Create a database. */
+    public function createDatabase(TenantWithDatabase $tenant): bool;
+
+    /** Delete a database. */
+    public function deleteDatabase(TenantWithDatabase $tenant): bool;
+
+    /** Does a database exist? */
+    public function databaseExists(string $name): bool;
+
+    /** Construct a DB connection config array. */
+    public function makeConnectionConfig(array $baseConfig, string $databaseName): array;
+
+    /**
+     * Set the DB connection that should be used by the tenant database manager.
+     *
+     * @throws NoConnectionSetException
+     */
+    public function setConnection(string $connection): void;
+}

src/Database/Contracts/TenantWithDatabase.php

@@ -0,0 +1,13 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Stancl\Tenancy\Database\Contracts;
+
+use Stancl\Tenancy\Contracts\Tenant;
+use Stancl\Tenancy\Database\DatabaseConfig;
+
+interface TenantWithDatabase extends Tenant
+{
+    public function database(): DatabaseConfig;
+}