[FL-3091] SubGhz: add protocol Alutech at-4n (#2352)

* GubGhz: add protocol Alutech at-4n
* SubGhz: fix syntax
* SubGhz: fix subghz_protocol_decoder_alutech_at_4n_get_hash_data
* SubGhz: add unit test alutech at-4n
* SubGhz: add name key

Co-authored-by: Aleksandr Kutuzov <alleteam@gmail.com>

lib/subghz/protocols/alutech_at_4n.h

@@ -0,0 +1,74 @@
+#pragma once
+#include "base.h"
+
+#define SUBGHZ_PROTOCOL_ALUTECH_AT_4N_NAME "Alutech at-4n"
+
+typedef struct SubGhzProtocolDecoderAlutech_at_4n SubGhzProtocolDecoderAlutech_at_4n;
+typedef struct SubGhzProtocolEncoderAlutech_at_4n SubGhzProtocolEncoderAlutech_at_4n;
+
+extern const SubGhzProtocolDecoder subghz_protocol_alutech_at_4n_decoder;
+extern const SubGhzProtocolEncoder subghz_protocol_alutech_at_4n_encoder;
+extern const SubGhzProtocol subghz_protocol_alutech_at_4n;
+
+/**
+ * Allocate SubGhzProtocolDecoderAlutech_at_4n.
+ * @param environment Pointer to a SubGhzEnvironment instance
+ * @return SubGhzProtocolDecoderAlutech_at_4n* pointer to a SubGhzProtocolDecoderAlutech_at_4n instance
+ */
+void* subghz_protocol_decoder_alutech_at_4n_alloc(SubGhzEnvironment* environment);
+
+/**
+ * Free SubGhzProtocolDecoderAlutech_at_4n.
+ * @param context Pointer to a SubGhzProtocolDecoderAlutech_at_4n instance
+ */
+void subghz_protocol_decoder_alutech_at_4n_free(void* context);
+
+/**
+ * Reset decoder SubGhzProtocolDecoderAlutech_at_4n.
+ * @param context Pointer to a SubGhzProtocolDecoderAlutech_at_4n instance
+ */
+void subghz_protocol_decoder_alutech_at_4n_reset(void* context);
+
+/**
+ * Parse a raw sequence of levels and durations received from the air.
+ * @param context Pointer to a SubGhzProtocolDecoderAlutech_at_4n instance
+ * @param level Signal level true-high false-low
+ * @param duration Duration of this level in, us
+ */
+void subghz_protocol_decoder_alutech_at_4n_feed(void* context, bool level, uint32_t duration);
+
+/**
+ * Getting the hash sum of the last randomly received parcel.
+ * @param context Pointer to a SubGhzProtocolDecoderAlutech_at_4n instance
+ * @return hash Hash sum
+ */
+uint8_t subghz_protocol_decoder_alutech_at_4n_get_hash_data(void* context);
+
+/**
+ * Serialize data SubGhzProtocolDecoderAlutech_at_4n.
+ * @param context Pointer to a SubGhzProtocolDecoderAlutech_at_4n instance
+ * @param flipper_format Pointer to a FlipperFormat instance
+ * @param preset The modulation on which the signal was received, SubGhzRadioPreset
+ * @return true On success
+ */
+bool subghz_protocol_decoder_alutech_at_4n_serialize(
+    void* context,
+    FlipperFormat* flipper_format,
+    SubGhzRadioPreset* preset);
+
+/**
+ * Deserialize data SubGhzProtocolDecoderAlutech_at_4n.
+ * @param context Pointer to a SubGhzProtocolDecoderAlutech_at_4n instance
+ * @param flipper_format Pointer to a FlipperFormat instance
+ * @return true On success
+ */
+bool subghz_protocol_decoder_alutech_at_4n_deserialize(
+    void* context,
+    FlipperFormat* flipper_format);
+
+/**
+ * Getting a textual representation of the received data.
+ * @param context Pointer to a SubGhzProtocolDecoderAlutech_at_4n instance
+ * @param output Resulting text
+ */
+void subghz_protocol_decoder_alutech_at_4n_get_string(void* context, FuriString* output);