feat: add jsonl_rename_key utility function and remove tablewriter dependency

- Add jsonl_rename_key() function to rename keys in JSONL files with mapping syntax 'old1:new1,old2:new2'
- Implements fast JSON parsing with fastjson and efficient buffered I/O for large files
- Include comprehensive test coverage with 7 test cases for edge cases and valid mappings
- Remove unused tablewriter dependency from go.mod/go.sum and internal/terminal/table.go
- Refactor printResultSummary() to use markdown table printing instead of tablewriter
- Add test data file ffuf-result.jsonl for integration testing
- Fix function list width default calculation in function.go

pkg/cli/function.go

@@ -435,11 +435,11 @@ func runFunctionList(cmd *cobra.Command, args []string) error {
 	}
 
 	headers := []string{"Category", "Function", "Description", "Returns"}
-	if globalWidth > 0 {
-		printMarkdownTableWithWidth(headers, rows, globalWidth)
-	} else {
-		printMarkdownTable(headers, rows)
+	width := globalWidth
+	if width <= 0 {
+		width = 65
 	}
+	printMarkdownTableWithWidth(headers, rows, width)
 	return nil
 }