CNC Milling Machines Market Forecast to 2028 - COVID-19 Impact and Global Analysis By Structure (Gantry, Moving Table, Fixed Table, and Column Type), X-Axis Working Range (Less than 2,000 mm; 2,001 mm to 5,000 mm; 5,001 mm to 7,000 mm; and Above 7,000 mm), Number of Axis (3-Axis, 4-Axis, 5-Axis, and Others), and Application (Automotive & Transportation, Aerospace & Defense, Oil & Gas, and Others)