gh-118469: Document sqlite3.Binary in module constants

Add documentation for sqlite3.Binary, which is an alias for memoryview
used for handling BLOB (Binary Large Object) data according to the
DB-API 2.0 specification.

The documentation explains:
- Binary is an alias for memoryview
- It's used for SQL BLOB values per DB-API 2.0 spec
- Binary data can also be handled directly with bytes objects
- Includes proper cross-references to related types

Fixes gh-118469

Author: killerdevildog

Doc/library/sqlite3.rst

@@ -498,6 +498,20 @@ Module constants
 
       The ``named`` DB-API parameter style is also supported.
 
+.. data:: Binary
+
+   A type object used to describe columns containing :abbr:`BLOB (Binary Large OBject)` data.
+   Implemented as an alias for :class:`memoryview`.
+
+   According to the DB-API 2.0 specification, :data:`!Binary` is used for SQL
+   ``BLOB`` (Binary Large Object) values. In :mod:`!sqlite3`, this is an alias
+   for the built-in :class:`memoryview` type.
+
+   .. note::
+
+      Binary data can also be stored and retrieved using :class:`bytes` objects
+      directly without using :data:`!Binary`.
+
 .. data:: sqlite_version
 
    Version number of the runtime SQLite library as a :class:`string <str>`.