feat: Added DataFrame class for SNP data manipulat

src/Snps/Utils/DataFrame.php

@@ -0,0 +1,41 @@
+<?php
+
+namespace Dna\Snps\Utils;
+
+class DataFrame {
+    private $data;
+
+    public function __construct(array $data = []) {
+        $this->data = $data;
+    }
+
+    public function filter(callable $callback): DataFrame {
+        $filteredData = array_filter($this->data, $callback, ARRAY_FILTER_USE_BOTH);
+        return new self($filteredData);
+    }
+
+    public function sort(array $columns, array $directions = []): DataFrame {
+        $sortedData = $this->data;
+        usort($sortedData, function ($a, $b) use ($columns, $directions) {
+            foreach ($columns as $index => $column) {
+                $direction = $directions[$index] ?? SORT_ASC;
+                if ($a[$column] == $b[$column]) {
+                    continue;
+                }
+                return ($a[$column] < $b[$column]) ? -1 * $direction : 1 * $direction;
+            }
+            return 0;
+        });
+        return new self($sortedData);
+    }
+
+    public function merge(DataFrame $other, string $on, string $type = 'inner'): DataFrame {
+        // Simplified merge function for demonstration purposes
+        $mergedData = []; // Implement merging logic based on $type (inner, left, right, outer)
+        return new self($mergedData);
+    }
+
+    public function getData(): array {
+        return $this->data;
+    }
+}