bpo-33729: Fix issues with arguments parsing in hashlib. (GH-8346)

* help(hashlib) didn't work because of incorrect module name in blake2b and
  blake2s classes.
* Constructors blake2*(), sha3_*(), shake_*() and keccak_*() incorrectly
  accepted keyword argument "string" for binary data, but documented as
  accepting the "data" keyword argument. Now this parameter is positional-only.
* Keyword-only parameters in blake2b() and blake2s() were not documented as
  keyword-only.
* Default value for some parameters of blake2b() and blake2s() was None,
  which is not acceptable value.
* The length argument for shake_*.digest() was wrapped out to 32 bits.
* The argument for shake_128.digest() and shake_128.hexdigest() was not
  positional-only as intended.
* TypeError messages for incorrect arguments in all constructors sha3_*(),
  shake_*() and keccak_*() incorrectly referred to sha3_224.

Also made the following enhancements:

* More accurately specified input and result types for strings, bytes and
  bytes-like objects.
* Unified positional parameter names for update() and constructors.
* Improved formatting.

Lib/test/test_hashlib.py

@@ -568,8 +568,12 @@ class HashLibTestCase(unittest.TestCase):
         self.assertRaises(ValueError, constructor, node_offset=-1)
         self.assertRaises(OverflowError, constructor, node_offset=max_offset+1)
 
+        self.assertRaises(TypeError, constructor, data=b'')
+        self.assertRaises(TypeError, constructor, string=b'')
+        self.assertRaises(TypeError, constructor, '')
+
         constructor(
-            string=b'',
+            b'',
             key=b'',
             salt=b'',
             person=b'',