add deflate implemented from first principles

.gitattributes

@@ -4,6 +4,7 @@
 langref.html.in text eol=lf
 lib/std/compress/testdata/** binary
 lib/std/compress/deflate/testdata/** binary
+lib/std/compress/flate/testdata/** binary
 
 lib/include/** linguist-vendored
 lib/libc/** linguist-vendored

build.zig

@@ -150,7 +150,7 @@ pub fn build(b: *std.Build) !void {
                 "rfc1951.txt",
                 "rfc1952.txt",
                 "rfc8478.txt",
-                // exclude files from lib/std/compress/deflate/testdata
+                // exclude files from lib/std/compress/flate/testdata
                 ".expect",
                 ".expect-noinput",
                 ".golden",

lib/std/compress.zig

@@ -1,11 +1,11 @@
 const std = @import("std.zig");
 
-pub const deflate = @import("compress/deflate.zig");
+pub const flate = @import("compress/flate.zig");
 pub const gzip = @import("compress/gzip.zig");
+pub const zlib = @import("compress/zlib.zig");
 pub const lzma = @import("compress/lzma.zig");
 pub const lzma2 = @import("compress/lzma2.zig");
 pub const xz = @import("compress/xz.zig");
-pub const zlib = @import("compress/zlib.zig");
 pub const zstd = @import("compress/zstandard.zig");
 
 pub fn HashedReader(
@@ -69,11 +69,11 @@ pub fn hashedWriter(
 }
 
 test {
-    _ = deflate;
-    _ = gzip;
     _ = lzma;
     _ = lzma2;
     _ = xz;
-    _ = zlib;
     _ = zstd;
+    _ = flate;
+    _ = gzip;
+    _ = zlib;
 }