Merge the AlwaysDispathPrettyPrinter into the now vendored PrettyPrinter

We don't need to keep the separation anymore, and this will make it
easier to extend

testing/io/test_pprint.py

@@ -0,0 +1,8 @@
+from _pytest._io.pprint import PrettyPrinter
+
+
+def test_pformat_dispatch():
+    printer = PrettyPrinter(width=5)
+    assert printer.pformat("a") == "'a'"
+    assert printer.pformat("a" * 10) == "'aaaaaaaaaa'"
+    assert printer.pformat("foo bar") == "('foo '\n 'bar')"

testing/io/test_saferepr.py

@@ -1,5 +1,4 @@
 import pytest
-from _pytest._io.saferepr import _pformat_dispatch
 from _pytest._io.saferepr import DEFAULT_REPR_MAX_SIZE
 from _pytest._io.saferepr import saferepr
 from _pytest._io.saferepr import saferepr_unlimited
@@ -159,12 +158,6 @@ def test_unicode():
     assert saferepr(val) == reprval
 
 
-def test_pformat_dispatch():
-    assert _pformat_dispatch("a") == "'a'"
-    assert _pformat_dispatch("a" * 10, width=5) == "'aaaaaaaaaa'"
-    assert _pformat_dispatch("foo bar", width=5) == "('foo '\n 'bar')"
-
-
 def test_broken_getattribute():
     """saferepr() can create proper representations of classes with
     broken __getattribute__ (#7145)