What is a storage canister

This container is used to record some key information when updating other containers,
so as to help users and developers better observe the running state of the container

How to use

1. In [dependencies]
   context ={ git = "https://github.com/0x000000000000000/context.git"

2. Import the context:: emit function. You can refer to
   https://github.com/0x000000000000000/storage_demo.git