[Collect feedback - important] Settings in cloud for Azure CLI

### **Why do we need this feature?**
Currently the settings for Azure CLI is only in our local machine, the customers may want to share the settings across their machines so they are always working with their favorite settings.

### **What do we provide?**
There will be two new arguments `--enable-settings-sync` and `--disable-settings-sync` for `az config` to allow customers to turn on settings sync or turn off settings sync.

### **How do we achieve this?**
We'll store settings in cloud (centralized storage or customers' own storage) and sync settings across different machines per customer's account.

### **We’ll be asking you for feedback on this feature. Your participation and feedback are very important to us -- I hope you will take the time to help us improve Azure CLI which a lot of people use every day.**

# **If you like this feature, please help click**👍
# **If you have any suggestions, please help comment under this issue.**

Thanks in advance
On behalf of Azure CLI team