对于平面直角坐标系\(xOy\)中的点\(P\)和\(\odot M\),给出如下定义:若\(\odot M\)上存在两个点\(A\),\(B\),使\(AB=2PM\),则称点\(P\)为\(\odot M\)的“美好点”.
\((1)\)当\(\odot M\)半径为\(2\),点\(M\)和点\(O\)重合时,
\(\;①\)点\({P}_{1}\left(-2,0\right) \) ,\({P}_{2}\left(1,1\right) \),\({P}_{3}\left(2,2\right) \)中,\(\odot O\)的“美好点”是_______;
\(\;②\)点\(P\)为直线\(y=x+b\)上一动点,点\(P\)为\(\odot O\)的“美好点”,求\(b\)的取值范围;
\((2)\)点\(M\)为直线\(y=x\)上一动点,以\(2\)为半径作\(\odot M\),点\(P\)为直线\(y=4\)上一动点,点\(P\)为\(\odot M\)的“美好点”,求点\(M\)的横坐标\(m\)的取值范围.