Consider making the semantics of `extracting` more similar to `having`

[grodin]

One thing worth exploring would be to add in addition to/replace extracting with a version of eachHaving that more directly mirrors having
ex:

assertThat(allUsers).eachHaving(User::name).isEqualTo(listOf("Alice", "Bob", "Eve"))

assertThat(allUsers).eachHaving("name") { it.name }.isEqualTo(listOf("Alice", "Bob", "Eve"))

Originally posted by @evant in #521 (comment)

I thought this was worth keeping around as a separate issue.

I'm keen to tackle it so opening the issue is as much to help me remember as anything!