[CLI]: `dab update` Cache Settings

Add capability to modify global and entity level cache settings within the CLI.

cache properties currently take the form:

```json
"cache": {
"ttl-seconds": 12,
"enabled": true
}
```
- `ttl-seconds` defaults to `5`
- `enabled` defaults to `false`

The model file for cache options has a hidden/non-json exposed property called `isUserDefined`. This property automatically captures whether the user explicitly sets `ttl-seconds`. If the user doesn't explicitly set a value, DAB uses the configured global cache `ttl-seconds` or if global settings aren't explicitly set, uses 5 seoconds. -> for CLI, if user doesn't explicitly set `ttl-seconds` DO NOT assume a default value and set. Just pass null.
When user does not define `ttl-seconds` the property `ttl-seconds` should NOT be written to the output JSON file. That is the behavior now, and shouldn't change.