fix(fetch/s3) Handle backpressure when upload large bodies (#20481)

Co-authored-by: cirospaciari <6379399+cirospaciari@users.noreply.github.com>

src/http/Encoding.zig

@@ -0,0 +1,22 @@
+pub const Encoding = enum {
+    identity,
+    gzip,
+    deflate,
+    brotli,
+    zstd,
+    chunked,
+
+    pub fn canUseLibDeflate(this: Encoding) bool {
+        return switch (this) {
+            .gzip, .deflate => true,
+            else => false,
+        };
+    }
+
+    pub fn isCompressed(this: Encoding) bool {
+        return switch (this) {
+            .brotli, .gzip, .deflate, .zstd => true,
+            else => false,
+        };
+    }
+};