add Half support for logsigmoid, threshold, elu, gelu, hardtanh, hardsigmoid, hardswish, hardshrink, softshrink, leakyrelu, softplus, glu, silu, mish, and prelu on CPU (#98745)
Pull Request resolved: https://github.com/pytorch/pytorch/pull/98745
Approved by: https://github.com/jgong5, https://github.com/mingfeima, https://github.com/ngimel
