Open API: New version 2.13 doc

[VarshSuresh]

Why?

Towards https://github.com/intercom/intercom/issues/384898

Version cut PR

https://github.com/intercom/intercom/pull/389313

New additions to V2.13

• Consistent Contact Timestamp Formats
• View associated custom object instances in other APIs (conversation / contacts)

Tickets API

• Add company id to the ticket update endpoint
• Allow skip notifications when creating / updating / replying tickets

Articles API

• View tags attached in Articles API

Conversation API

• View email meta data for conversations sent as email
• View response time and handling time metrics
• View the current conversation state at each conversation part
• View tags for each conversation part
• View event details about relevant workflows/actions in conversation parts
• Allow update title

New endpoints

• Delete conversation by ID
• Get contacts by external_id,
• Delete ticket by ID
• Block contact by ID
• Custom object instance API

Proceed with caution as this PR is huge ☠️

[steve-henry]

Is "Enforce ticket permissions" actually live? I think it was rolled back behind a feature flag and I'm not sure it ever actually went out.

[Eclairemoy]

🚀

[VarshSuresh]

Is "Enforce ticket permissions" actually live? I think it was rolled back behind a feature flag and I'm not sure it ever actually went out.

@steve-henry Yes you are right it is currently under a killswitch FF. We will need a plan to roll this one out. I will remove this from stable for now. 🙏

[VarshSuresh]

Indentation error fix