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/ColumnReflectionInterface.php

@@ -0,0 +1,20 @@
+<?php
+
+namespace SparkPlug\Com\Noccy\Pdo\Reflection;
+
+use SparkPlug\Com\Noccy\Pdo\PdoResource;
+
+interface ColumnReflectionInterface
+{
+
+    public function isPrimaryKey(): bool;
+
+    public function isNullable(): bool;
+
+    public function getName(): string;
+
+    public function getType(): string;
+
+    public function getDefaultValue(): mixed;
+}
+