feat(new tools): Units Converter

All units, pressure, power, angle, area, energy, force, length, mass, volume units converter
Many Units Converter: convert any unit string (ie 1d 3m) into best unit and selected target unit

Fix #571

src/tools/length-converter/index.ts

@@ -0,0 +1,12 @@
+import { SquareHalf } from '@vicons/tabler';
+import { defineTool } from '../tool';
+
+export const tool = defineTool({
+  name: 'Length Units Converter',
+  path: '/length-converter',
+  description: 'Convert values from length units',
+  keywords: ['length', 'converter'],
+  component: () => import('./length-converter.vue'),
+  icon: SquareHalf,
+  createdAt: new Date('2024-08-15'),
+});