Remove Sentry.Interfaces.Span (#689)

This was not released yet. See #538 (comment).

lib/sentry/interfaces.ex

@@ -267,56 +267,4 @@ defmodule Sentry.Interfaces do
       :stacktrace
     ]
   end
-
-  defmodule Span do
-    @moduledoc """
-    The struct for a tracing **span**.
-
-    See <https://develop.sentry.dev/sdk/event-payloads/span>.
-    """
-
-    @moduledoc since: "11.0.0"
-
-    @typedoc since: "11.0.0"
-    @type t() :: %__MODULE__{
-            start_timestamp: String.t() | number(),
-            timestamp: String.t() | number(),
-            span_id: String.t(),
-            parent_span_id: String.t() | nil,
-            description: String.t(),
-            tags: map(),
-            trace_id: String.t() | nil,
-            op: String.t(),
-            spans: [t()],
-            status: String.t(),
-            data: map(),
-            origin: String.t(),
-            measurements: %{
-              optional(String.t()) => %{required(:value) => term(), optional(:unit) => String.t()}
-            },
-
-            # Attributes that are only for "transactions", which are basically the root
-            # span of a trace. https://develop.sentry.dev/sdk/event-payloads/transaction/
-            event_id: String.t() | nil,
-            transaction_info: %{source: :custom | :url | :route | :view | :component | :task}
-          }
-
-    defstruct [
-      :event_id,
-      :description,
-      :tags,
-      :parent_span_id,
-      :trace_id,
-      :op,
-      :span_id,
-      :start_timestamp,
-      :timestamp,
-      :spans,
-      :measurements,
-      :transaction_info,
-      :status,
-      :data,
-      :origin
-    ]
-  end
 end