Deployment: Not handling type errors in parameter entry very well

Main.bicep:
```bicep 
param a int
```
Main.params.json:
```json
{
    "$schema": "https://schema.management.azure.com/schemas/2019-04-01/deploymentParameters.json#",
    "contentVersion": "1.0.0.0",
    "parameters": {
     
    }
}
```
When deploying, press ENTER for the 'a' parameter value, or enter a string value such as abc.
UNEXPECTED: Deploy will continue.  EXPECTED: To retry input
 Ask to save values to the params file
UNEXPECTED: The value does not get saved
UNEXPECTED: The error you get is difficult to debug (doesn't mention which parameter or its value):

```
3:38:03 PM: Deployment failed for /Users/stephenweatherford/repos/abc/main.bicep. Please fix following issues in the parameter file /Users/stephenweatherford/repos/abc/main.params.json: Input string was not in a correct format.
```