Xamarin AIDL CSharpCodeGenerator doesn't support specifying transaction IDs

### Android application type

.NET Android (net7.0-android, net8.0-android, etc.)

### Affected platform version

VS 2022

### Description

AIDL interface generation doesn't support specifying transaction ID
```
package com.example;

interface IExample
{
void destroy();
int Add(int value1, int value2) = 2;
}
```

Gets an error "invalid character ="

https://github.com/xamarin/xamarin-android/blob/e987ac458536e59a8329a06d5c5d5f4d4ea2c6b6/src/Xamarin.Android.Tools.Aidl/CSharpCodeGenerator.cs#L391 probably relevant

### Steps to Reproduce

1. Create new project with basic .aidl file
2. Add a basic AIDL interface and specify transaction ID
3. "Invalid character: =" error

### Did you find any workaround?

Manually edit them in the generated file but this is incredibly tedious

### Relevant log output

_No response_