[ably-java] Implement no-connection-serial

[jamienewcomb]

Implement the changes listed in ably/docs#1526
Reference impl ~~> https://github.com/ably/ably~~js/pull/1045

[deanna-seta]

The corresponding Jira issue is https://ably.atlassian.net/browse/SDK-2634

[sacOO7]

Going through the relevant PR's and code.