[Feature Request] - `variable-group create` to support multiline `--description`

**Is your feature request related to a problem? Please describe.**
When creating a variable-group, I would like to add a multi-line description. I have tried the following

```ps1
# Using \n: Results in "line 1\n Line2"
az pipelines variable-group create --name 'myVariableGroup' --variables 'hello=world' --description "line 1\n Line2"

# Using \\n: Results in "line 1\\n Line2"
az pipelines variable-group create --name 'myVariableGroup' --variables 'hello=world' --description "line 1\n Line2"

# Using `n: Results in "line 1"
az pipelines variable-group create --name 'myVariableGroup' --variables 'hello=world' --description "line 1`nLine2"

# Using --description twice: Results in "line2"
az pipelines variable-group create --name 'myVariableGroup' --variables 'hello=world' --description "line 1" --description "Line2"

# Using `n: Results in error - I suspect the `n is treated as an enter / end of command.
az pipelines variable-group create --name 'myVariableGroup' --description "line 1`nLine2" --variables 'hello=world'

```
**Describe the solution you'd like**
I would like the `--description` to honor either `\n` or support multi-line comments in any way.

**Additional context**
Add any other context or screenshots about the feature request here.