feature(wrh): add soft modulization in unizero

[ruiheng123]

• Soft Modulation in Unizero: Adding gate route network to adjust different weights for a network with multi-modules and multi-layers.
• Paper link: https://arxiv.org/abs/2003.13661

[puyuan1996]

We have a new polished PR https://github.com/opendilab/LightZero/pull/246/.