feat(v2): add user/rebind-phone{/send-message}

[hyrious]

cc @netless-io/native

The flow:

1. User login with wechat, and Flat asks to bind a phone
2. User hit [send message] from binding phone page, but it throws error about the phone is already registered (SMSAlreadyBinding)
3. Replace that error with this: ask the user whether to merge this account into that phone, this means all data in this account will be lost
4. User hit [yes], then take him to the rebind phone page
5. User hit [send message] from that page, then enter the code to process this action
6. As a result, this endpoint returns the rebind status and a full payload of login (with jwt token)

Note that these steps cannot be automated in flat server, where "automated" means User hit [send message], then SMSAlreadyBinding, then directly call rebind-phone/send-message, then let him process the rebind without notification. This is because we have no clue about whether an account is newly created or not (whether he has uploaded assets into cloud storage, or created room).

[syt-honey]

cc @netless-io/native

The flow:

1. User login with wechat, and Flat asks to bind a phone
2. User hit [send message] from binding phone page, but it throws error about the phone is already registered (SMSAlreadyBinding)
3. Replace that error with this: ask the user whether to merge this account into that phone, this means all data in this account will be lost
4. User hit [yes], then take him to the rebind phone page
5. User hit [send message] from that page, then enter the code to process this action
6. As a result, this endpoint returns the rebind status and a full payload of login (with jwt token)

Note that these steps cannot be automated in flat server, where "automated" means User hit [send message], then SMSAlreadyBinding, then directly call rebind-phone/send-message, then let him process the rebind without notification. This is because we have no clue about whether an account is newly created or not (whether he has uploaded assets into cloud storage, or created room).

Noted.