PDO plugin: Reflections

* com.noccy.pdo: Implemented reflection for PDO databases,
  tables and columns. Reflectors for MySQL and Sqlite.
* com.noccy.pdo: Added pdo:inspect command.
* com.noccy.docker: Added basic stack management and commands.
* com.noccy.docker: Moved commands to dedicated namespace.
* Environment: readConfig and writeConfig helper added, with
  a flag to use the global config dir ~/.config/spark.

plugins/com.noccy.pdo/Reflection/Reflector/ReflectorInterface.php

@@ -0,0 +1,16 @@
+<?php
+
+namespace SparkPlug\Com\Noccy\Pdo\Reflection\Reflector;
+
+use SparkPlug\Com\Noccy\Pdo\PdoResource;
+use SparkPlug\Com\Noccy\Pdo\Reflection\DatabaseReflectionInterface;
+use SparkPlug\Com\Noccy\Pdo\Reflection\TableReflectionInterface;
+
+interface ReflectorInterface
+{
+    public function createDatabaseReflection(): DatabaseReflectionInterface;
+
+    public function createTableReflection(string $table): TableReflectionInterface;
+
+}
+