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feat: Rollback Plugin (#191)

## Updates
- Adds new `rollback` plugin
- Fixes `deploy list` to show actual timestamp from name, which is used for rollback
- Adds required functionality to `AzureBlobStorageService` and `ArmService`
- Adds previously missing tests of required functionality

## How to Use
1. Get a timestamp. Use
```
sls deploy list
```
to retrieve one.
2. Roll back function app to timestamp
```
sls rollback -t <timestamp>
```

## Options
In `deploy` section of `serverless.yml`, you can specify whether to run from a blob URL or deploy the package directly to the function app by setting:
```yaml
deploy:
  # Default is false
  runFromBlobUrl: true|false
```

Resolves [AB#317]

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