cli.json is case insensitive and it is really hard to read

### Is this related to a new or existing Amplify category?

New category

### Is this related to another service?

amplify_flutter

### Describe the feature you'd like to request

Hi teams,

The generated file cli.json in flutter are case insensitive, it is really hard to read

```dart
{
"features": {
"graphqltransformer": {
"addmissingownerfields": true,
"improvepluralization": true,
"validatetypenamereservedwords": true,
"useexperimentalpipelinedtransformer": false,
"enableiterativegsiupdates": true,
"secondarykeyasgsi": true,
"skipoverridemutationinputtypes": true
},
"frontend-ios": {
"enablexcodeintegration": true
},
"auth": {
"enablecaseinsensitivity": true,
"useinclusiveterminology": true,
"breakcirculardependency": true,
"forcealiasattributes": false
},
"codegen": {
"useappsyncmodelgenplugin": true,
"usedocsgeneratorplugin": true,
"usetypesgeneratorplugin": true,
"cleangeneratedmodelsdirectory": true,
"retaincasestyle": true,
"addtimestampfields": true,
"handlelistnullabilitytransparently": true,
"emitauthprovider": true,
"generateindexrules": true,
"enabledartnullsafety": true
},
"appsync": {
"generategraphqlpermissions": true
},
"latestregionsupport": {
"pinpoint": 1,
"translate": 1,
"transcribe": 1,
"rekognition": 1,
"textract": 1,
"comprehend": 1
}
}
}
```

### Describe the solution you'd like

camel case will be good solution, I believe most developers will happy with it

### Describe alternatives you've considered

lowercase with underscores

### Additional context

_No response_

### Is this something that you'd be interested in working on?

- [ ] 👋 I may be able to implement this feature request
- [ ] ⚠️ This feature might incur a breaking change