Streaming operations

Mark methods as streaming for appropriate SDK generation:

openrpc.yml
1methods:
2 - name: logs.stream
3 summary: Stream log events
4 x-fern-streaming:
5 type: server_sent_events
6 termination: client_closes
7 params:
8 - name: filters
9 schema:
10 type: object
11 properties:
12 level:
13 type: string
14 enum: [debug, info, warn, error]
15 service:
16 type: string
17 # Note: Streaming methods typically don't have a traditional result