Creation of TDs seems to merge @type and type

For example, If I try to add the following TD
(Note: the terms `@type` and `type` for the property `lampStatus` are separated)

```JSON
{
"@context": [
"https://www.w3.org/2019/wot/td/v1",
{
"opc": "http://opcfoundation.org/UA/",
"iec61360": "https://webstore.iec.ch/publication/5381",
"eclass": "https://www.eclasscontent.com/owl/v11.1",
"@language": "en"
}
],
"id": "urn:siemens:demo:case:lamp",
"title": "Demo Lamp Case",
"@type": "eclass:IRDI_0173-1#01-ADP410#010",
"securityDefinitions": {
"nosec_sc": {
"scheme": "nosec"
}
},
"security": "nosec_sc",
"base": "opc.tcp://192.168.120.237:4840/",
"properties": {
"lampStatus": {
"title": "Provides lamp status",
"description": "True=Lamp is on; False=Lamp is off",
"readOnly": true,
"type": "boolean",
"@type": [
"opc:Boolean",
"iec61360:BooleanType"
],
"forms": [
{
"op": "readproperty",
"href": "ns=3;s=\"LED\".\"State\"",
"opcua:nodeId": "ns=3;s=\"LED\".\"State\"",
"opc:method": "READ"
}
]
}
}
}
```

and later on I try to retrieve it again I get it back looking like the following

```JSON
{
//...
"lampStatus": {
"type": [
"iec61360:BooleanType",
"opc:Boolean",
"boolean"
],
"readOnly": true,
"description": "True=Lamp is on; False=Lamp is off",
"forms": [
{
"opc:method": "READ",
"op": "readproperty",
"href": "ns=3;s=\"LED\".\"State\"",
"opcua:nodeId": "ns=3;s=\"LED\".\"State\""
}
],
"title": "Provides lamp status"
}
}
```

The problem is that the container for `@type` and `type` are now mixed together in `type`