Matcher for reading from channels

Often we are asserting on reading from a channel. It would be useful to have one that could read from channel and make further assertions on the result.

e.g.

```go
c := make(chan int, 100)
// ...
expect(c).To.Receive().And.Equal(90)
```

This example has more than just the `Receive` functionality. It also includes some chaining. If is distasteful, then maybe the following would be more palatable:

```go
c := make(chan int, 100)
// ...
expect(c).To.Receive(&i).Else.FailNow()
expect(i).To.Equal(90)
```

Look at the existing matchers in the expect package to understand the pattern. The new matcher likely needs to be added to the matchers directory, handle channel operations, and support chaining or a separate assertion. Check how other matchers integrate with the expectation chain and how they handle failure reporting. Write a test in the test suite to verify the receive functionality works with both buffered and unbuffered channels.

索引モデルが issue の本文から書いたものです。