Adding context to class wrappers

[HamidrezaKmK]

Sometimes we need to add a context to a class wrapper for calling it later on from other sections of the code:

# context can be a list of multiple contexts to consider
@dyw.dynamize(add_contexts=['torch'])
class A:
    layer = dyw.composite('nn.Linear`, in_features=10, out_features=100)

[vahidzee]

This could also be done for each field or method as well.