pg_dump: Add support for zstd compression

Allow pg_dump to use the zstd compression, in addition to gzip/lz4. Bulk
of the new compression method is implemented in compress_zstd.{c,h},
covering the pg_dump compression APIs. The rest of the patch adds test
and makes various places aware of the new compression method.

The zstd library (which this patch relies on) supports multithreaded
compression since version 1.5. We however disallow that feature for now,
as it might interfere with parallel backups on platforms that rely on
threads (e.g. Windows). This can be improved / relaxed in the future.

This also fixes a minor issue in InitDiscoverCompressFileHandle(), which
was not updated to check if the file already has the .lz4 extension.

Adding zstd compression was originally proposed in 2020 (see the second
thread), but then was reworked to use the new compression API introduced
in e9960732a9. I've considered both threads when compiling the list of
reviewers.

Author: Justin Pryzby
Reviewed-by: Tomas Vondra, Jacob Champion, Andreas Karlsson
Discussion: https://postgr.es/m/20230224191840.GD1653@telsasoft.com
Discussion: https://postgr.es/m/20201221194924.GI30237@telsasoft.com

src/bin/pg_dump/pg_backup_archiver.c

@@ -2120,7 +2120,7 @@ _discoverArchiveFormat(ArchiveHandle *AH)
 
 		/*
 		 * Check if the specified archive is a directory. If so, check if
-		 * there's a "toc.dat" (or "toc.dat.{gz,lz4}") file in it.
+		 * there's a "toc.dat" (or "toc.dat.{gz,lz4,zst}") file in it.
 		 */
 		if (stat(AH->fSpec, &st) == 0 && S_ISDIR(st.st_mode))
 		{
@@ -2134,6 +2134,10 @@ _discoverArchiveFormat(ArchiveHandle *AH)
 #ifdef USE_LZ4
 			if (_fileExistsInDirectory(AH->fSpec, "toc.dat.lz4"))
 				return AH->format;
+#endif
+#ifdef USE_ZSTD
+			if (_fileExistsInDirectory(AH->fSpec, "toc.dat.zst"))
+				return AH->format;
 #endif
 			pg_fatal("directory \"%s\" does not appear to be a valid archive (\"toc.dat\" does not exist)",
 					 AH->fSpec);