Poly Tetramethylene Ether Glycol (PTMG) Market Size, Share, Growth, Industry Analysis, Trends and Dynamics, By Types (PTMG 650, PTMG 1000, PTMG 1800/2000, Others), By Applications (Spandex Fiber, COPE, PU Elastomer, Others) , and Regional Insights and Forecast to 2035