Proposal: allow for tagging Doctests

[Devon Estes]

I have some Doctests that emit logs, and I don't want that stuff clogging up my terminal, so I would like to be able to tag those with `:capture_log` like I can with other tests.

What do folks think about something like this, which would apply that tag to all doctests generated with that call to the `doctest/2` macro:

```elixir

defmodule PostTest do

  use ExUnit.Case

  @tag :capture_log

  doctest Post

  test "is a test" do

    # ...

  end

end

```

Alternatively, we could apply tags with options to the macro call, like so:

```elixir

defmodule PostTest do

  use ExUnit.Case

  doctest Post, import: true, tags: [capture_log: true]

  test "is a test" do

    # ...

  end

end

```

[José Valim]

We can definitely support the option based synytax. PRs are welcome.

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