Need ability to clear all storage

### Which service(blob, file, queue, table) does this issue concern?
All

### Which version of the Azurite was used?
3.8.0

### Where do you get Azurite? (npm, DockerHub, NuGet, Visual Studio Code Extension)
npm

### What's the Node.js version?
12.18.4

### What problem was encountered?
I need to be able to clear storage like I could with Azure Storage Emulator using `clear all`, `clear blob`, etc.

### Steps to reproduce the issue?
I'm working off the output from `-h` - it says nothing about the ability to do this.

### Have you found a mitigation/solution?
No, I am new to Azurite so I'm unsure if there's some "hack" you can do to effectively do this.

Use case:
When developing with a technology like Durable Functions, which heavily utilizes queues, tables, and blob to maintain state of orchestrations it's incredibly useful to be able to clear backend storage contents as a way to "restart" an orchestration debugging session.