Crowdin package doesn't handle parameters correctly

**Describe the bug**
When I create string in crowdin website with variable {business} inside text it creates arb file with string with such structure
"some_translation": "Discount for {business}"
As it's not structure, crowdin generator makes corrupted class
"some_translation": "Discount for {business}",
"@some_translation": {
"placeholders": {
"business": {
"type": "String"
}
}
},

**To Reproduce**
Steps to reproduce the behavior:
1. Latest sdk (0.6.3)
2. Create arb file:
```
{
"@@locale": "en",
"some_translation": "Discount for {business}"
}
```
3. Generate class with
fvm flutter gen-l10n
fvm dart run crowdin_sdk:gen
4. Try to run app
5. See an error

**Expected behavior**
Generator makes not getter for this string but function with parameter that could be passed into as default intl generates
String some_translation(Object business);

**Environment**
- Crowdin Flutter SDK: 0.6.3
- Flutter version: 3.24.1
- Dart version: bundled in flutter

**Additional context**
I'm using crowdin on the web to create strings

Reproduce the issue with the supplied ARB content, Flutter 3.24.1, and the commands fvm flutter gen-l10n and fvm dart run crowdin_sdk:gen. Inspect the generator entry point used by the latter command; done means the generated localization API accepts business as a parameter instead of producing a getter that causes the app to fail.

Written by the indexing model from the issue text.