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/MysqlDatabaseReflection.php

@@ -0,0 +1,42 @@
+<?php
+
+namespace SparkPlug\Com\Noccy\Pdo\Reflection\Reflector;
+
+use PDO;
+use SparkPlug\Com\Noccy\Pdo\PdoResource;
+use SparkPlug\Com\Noccy\Pdo\Reflection\DatabaseReflectionInterface;
+use SparkPlug\Com\Noccy\Pdo\Reflection\TableReflectionInterface;
+
+class MysqlDatabaseReflection implements DatabaseReflectionInterface
+{
+
+    private PDO $pdo;
+
+    private array $tables = [];
+
+    public function __construct(PdoResource $db)
+    {
+        $pdo = $db->getPDO();
+
+        $tableQuery = $pdo->prepare('show full tables');
+        $tableQuery->execute();
+        $tables = $tableQuery->fetchAll(PDO::FETCH_ASSOC);
+
+        foreach ($tables as $table) {
+            $name = reset($table);
+            $this->tables[$name] = new MysqlTableReflection($db, $name);
+        }
+
+    }
+
+    public function getAllTables(): array
+    {
+        return $this->tables;
+    }
+
+    public function getTable(string $name): ?TableReflectionInterface
+    {
+        return $this->tables[$name] ?? null;
+    }
+}
+