Add expect {} with coroutine support (suspend lambda)

[tenor-dev]

Platform (all, jvm, js): all
Extension (none, kotlin 1.3): none

Currently you need to write

expect { runBlocking { suspendFunction() }}.toThrow<Something>()

It would be great to have suspending built-in:

coExpect { suspendFunction() }.toThrow<Something>()

"co" prefix is already used by mockk: coVerify() and coEvery(), so it will be familiar to developers.

coExpect function should be a suspend function itself, so it can be used inside of runTest {} from kotlinx-coroutines-test.

[robstoll]

Thanks for the idea, I'll consider your suggestion in #363.
Since this issue is a duplicate of it, I'll close this one. Please up-vote the other (react with 👍 on the issue description).
See #363 (comment) for a function you could use until atrium provides something built in.
In case you have some spare time, then please read the discussion in the other issue and add your comment, thanks