Add Excel processing functionality with merge pattern application

- Introduced `index.ts` to read an Excel file and apply merge patterns to specified ranges.
- Created `lib.ts` with utility functions for column number conversion and merge pattern application.
- Updated execution counts in `carbone.ipynb` to reflect the new code structure.

notebooks/excel/index.ts

@@ -0,0 +1,43 @@
+import ExcelJS from "exceljs";
+import { applyMergePattern } from "./lib";
+
+/* const inputFile = Bun.file("mapa.xlsx");
+const inputBuffer = await inputFile.arrayBuffer();
+
+const workbook = new ExcelJS.Workbook();
+await workbook.xlsx.load(inputBuffer); */
+
+const workbook = new ExcelJS.Workbook();
+await workbook.xlsx.readFile("mapa.xlsx");
+
+const sheetName = 'RÍGIDO-Anexo 2 (A)'
+const sheet = workbook.getWorksheet(sheetName)
+if (!sheet) {
+    throw new Error(`Workbook has no sheet named: ${sheetName}`);
+}
+
+const CICLOS = 9;
+const matrizAsignaturas = {
+    startColumns: ["C", "I", "O", "U", "AA"],
+    firstStartRow: 8,
+    mergeWidthInColumns: 5,
+    mergeHeightInRows: 3,
+    mergeBlockCount: CICLOS,
+    rowStepBetweenBlocks: 14 - 8,
+} as const;
+const semestres = {
+    startColumns: ["A"],
+    firstStartRow: 7,
+    mergeWidthInColumns: 1,
+    mergeHeightInRows: 5,
+    mergeBlockCount: CICLOS,
+    rowStepBetweenBlocks: 13 - 7,
+} as const;
+
+applyMergePattern(sheet, matrizAsignaturas);
+applyMergePattern(sheet, semestres);
+
+const outputBuffer = await workbook.xlsx.writeBuffer();
+await Bun.write("excel2.xlsx", outputBuffer);
+
+const end = Bun.nanoseconds();