runtime(misc): Add support for lz4 to tar & gzip plugin

while at it, clean up the tar plugin a bit and sort the patterns for the
tar and gzip plugin

References:
- https://github.com/lz4/lz4
- https://lz4.org/

closes: #16591

Signed-off-by: Christian Brabandt <cb@256bit.org>
Signed-off-by: Corpulent Robin <177767857+corpulentrobin@users.noreply.github.com>

runtime/doc/pi_gzip.txt

@@ -1,4 +1,4 @@
-*pi_gzip.txt*   For Vim version 9.1.  Last change: 2023 Nov 14
+*pi_gzip.txt*   For Vim version 9.1.  Last change: 2025 Feb 06
 
 
 		  VIM REFERENCE MANUAL    by Bram Moolenaar
@@ -28,12 +28,13 @@ The plugin installs autocommands to intercept reading and writing of files
 with these extensions:
 
 	extension	compression ~
-	*.Z		compress (Lempel-Ziv)
-	*.gz		gzip
 	*.bz2		bzip2
+	*.gz		gzip
+	*.lz		lzip
+	*.lz4		lz4
 	*.lzma		lzma
 	*.xz		xz
-	*.lz		lzip
+	*.Z		compress (Lempel-Ziv)
 	*.zst		zstd
 
 That's actually the only thing you need to know.  There are no options.