AutoValueSchema does not support arbitrary named getters.

AutoValueSchema fails to detect getters with non-pojo names.

Example:

```

@DefaultSchema(AutoValueSchema.class)

@AutoValue
class Example

{ 

  abstract int id();

 
static Example create(int id) \\{ return new AutoValue_Example(id); }

}

```

Imported from Jira [BEAM-11609](https://issues.apache.org/jira/browse/BEAM-11609). Original Jira may contain additional context.
Reported by: dpcollins-google.