Provide more nodes in artificial neural networks

[chaoming0625]

Please:

• Check for duplicate requests.
• Describe your goal, and if possible provide a code snippet with a motivating example.

Currently, BrainPy provides excellent nodes in reservoir computing and recurrent neural networks. However, there are much more layers or modles which are useful when constructing dynamics training models. Such as Convolution kernels, transformers, batch normarlizations,etc.

[chaoming0625]

See recent advances:

• feat: add the batch normalization node #138
• feat: update the API and test for batch normalization  #142

[chaoming0625]

Recent advances:

• Add LayerNorm, GroupNorm, and InstanceNorm as nn_nodes in normalization.py #162
• feat: add conv & pooling nodes #161