Implement parallel processing for template handling to improve performance

[franklinjavier]

pix-pdf/src/bin/generate-pdfs.ts

Lines 77 to 83 in 63d7a56

	for (const template of Object.keys(templatesMap)) {
	console.log(`Generating ${template}...`);
	const templateStart = Date.now();
	await createTemplatePdfs(mapTemplates(template));
	const templateEnd = Date.now();
	console.log(`${template} generated in ${templateEnd - templateStart}ms`);
	}

The code currently processes templates one by one in a serial manner, which might be inefficient if the number of templates is large or if each template takes significant time to process. Using parallel processing could reduce the overall time.