ED entries are converted to editors in Mendeley

Mendeley maps `A2` entries to editors. The same is true for `ED` entries:

```none
TY - JOUR
TI - ED is for editors too?
A2 - EditorSurname_A, EditorName_A
ED - EditorSurname_B, EditorName_B
ER -
```

Becomes:

```json
{
"title": "ED is for editors too?",
"type": "journal",
"editors": [
{
"first_name": "EditorName_A",
"last_name": "EditorSurname_A"
},
{
"first_name": "EditorName_B",
"last_name": "EditorSurname_B"
}
]
}
```

No file or test path is given. Locate the RIS parsing entry point and existing handling for A2 editor entries, reproduce the supplied record, and check how ED entries are classified. Done means ED and A2 contributors both appear in the editors output without changing the title or type.

Written by the indexing model from the issue text.