gh-132983: Introduce compression package and move _compression module (GH-133018)

* Introduces `compression` package for https://peps.python.org/pep-0784/

This commit introduces the `compression` package, specified in PEP 784
to re-export the `lzma`, `bz2`, `gzip`, and `zlib` modules. Introduction
of `compression.zstd` will be completed in a future commit once the
`_zstd` module is merged.

This commit also moves the `_compression` private module to
`compression._common._streams`.

* Re-exports existing module docstrings.

Lib/compression/lzma/__init__.py

@@ -0,0 +1,5 @@
+import lzma
+__doc__ = lzma.__doc__
+del lzma
+
+from lzma import *