Including editor affiliation information in conference.yaml file

[xinru1414]

Starting with EMNLP 2022, we include author affiliation information on ACL anthology (see this ingestion ticket ). Such information can be extracted from papers.yaml file. However, editors affiliation information is currently missing in the conference.yaml file.

Proposed solution:

1. Include editor affiliation flag in the conference.yaml file for future conferences so that such information can be ingested. The editor field in the conference.yaml file should look like this:

editors:
  - first_name:
    last_name:
    affiliation:
  - first_name: 
    last_name:
    affiliation:

3. For the sake of consistency, only use affiliation flag in both conference.yaml and papers.yaml files for future conferences. Currently some venues use institution instead of affiliation in the papers.yaml file.