refactor(postgres) improve postgres code base (#20808)

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

src/sql/postgres/protocol/ReadyForQuery.zig

@@ -0,0 +1,18 @@
+const ReadyForQuery = @This();
+status: TransactionStatusIndicator = .I,
+pub fn decodeInternal(this: *@This(), comptime Container: type, reader: NewReader(Container)) !void {
+    const length = try reader.length();
+    bun.assert(length >= 4);
+
+    const status = try reader.int(u8);
+    this.* = .{
+        .status = @enumFromInt(status),
+    };
+}
+
+pub const decode = DecoderWrap(ReadyForQuery, decodeInternal).decode;
+
+const DecoderWrap = @import("./DecoderWrap.zig").DecoderWrap;
+const NewReader = @import("./NewReader.zig").NewReader;
+const TransactionStatusIndicator = @import("./TransactionStatusIndicator.zig").TransactionStatusIndicator;
+const bun = @import("bun");