Feat support notify the bot has been deleted or the bot delete contact

[su-chang]

Background

We need a new event for receive these notifications:

1. the bot has been deleted by contact
2. the bot delete contact by WeCom App in the phone

Due to we have friendship event already, I think it's better to reuse this event receive friendship delete event.

The only one thing we should do is that add a new type in FriendshipType:

wechaty-puppet/src/schemas/friendship.ts

Lines 1 to 6 in 5fb409b

	export enum FriendshipType {
	Unknown = 0,
	Confirm,
	Receive,
	Verify,
	}

Named the new FriendshipType type as Delete.

 export enum FriendshipType { 
   Unknown = 0, 
   Confirm, 
   Receive, 
   Verify, 
   Delete, 
 } 

Discuss

These two notifications should use the same type Deleted? Or add different type for them, e.g. Remove and Delete.

• Remove: the bot has been deleted by contact
• Delete: the bot delete contact by WeCom App in the phone

[su-chang]

Vote for add two different FriendshipType: Remove and Delete

[su-chang]

Conclusion

• Removed: the bot has been removed by contact
• Delete: the bot delete contact by WeCom App in the phone

[windmemory]

It would be better to clearly separate the two concept with the types, so either Removed and Delete or Deleted and Delete.