added DigitalSequence and PulseReader (#2070)

* added DigitalSequence to chain multiple DigitalSignals
added PulseReader for hardware assisted digital signal sampling
* added send_time option to start a signal at a specific DWT->CYCCNT value
* fixed linter errors and undone function renaming
* fixed renaming
* flagged functions in api_symbols.csv
* allow gpio field to stay uninitialized in digital_signal_prepare_arr()
* fix test cases to match (expected) implementation
* pulse_reader: build as static library
Signed-off-by: g3gg0.de <git@g3gg0.de>
* fix starting level detection in pulse_reader
* added unit test for pulse_reader
* change pulse reader test timings to 1, 10 and 100 ms
* fine tuned timings for pulse_reader test
* pulse_reader_stop now deinits GPIO as recommended by @gornekich
* ran format_py
* pulse_reader: remove from API, allow to link with faps
Signed-off-by: g3gg0.de <git@g3gg0.de>
* remove unit test for pulse_reader again
* pulse_reader: add call to set GPIO pull direction
* make structures private, add C implementation of digital_signal_update_dma()
* digital_signal/pulse_reader: allow parameters for free to be NULL
* digital_signal: show unoptimized and optimized code for digital_signal_update_dma() next to each other
* pulse_reader: further optimize assembly code
* digital_signal: reduce code complexity of digital_signal_update_dma() by only reconfiguring DMA2
* digital_signal: remove assembly code, limiting the performance but increasing portability
* added recovery if the timer already expired
* digital_signal: fix memory leak
* digital_signal: keep lock until all DMA transfers have finished
* DigitalSequence: fix issues with concatenation of same levels and spurious bit flips
* DigitalSignal: use cyclic DMA buffer for sequences
* update api_symbols.csv
* Update api_symbols.csv for f18 target
* Patches from @gornekich to fix linter warnings.
* Remove some redundant if checks
* Remove some magic numbers and reformat.
* Remove forced terminating edge.

Signed-off-by: g3gg0.de <git@g3gg0.de>
Co-authored-by: gornekich <n.gorbadey@gmail.com>
Co-authored-by: Tiernan Messmer <tiernan.messmer@gmail.com>
Co-authored-by: Aleksandr Kutuzov <alleteam@gmail.com>

lib/SConscript

@@ -4,6 +4,7 @@ env.Append(
     LINT_SOURCES=[
         Dir("app-scened-template"),
         Dir("digital_signal"),
+        Dir("pulse_reader"),
         Dir("drivers"),
         Dir("flipper_format"),
         Dir("infrared"),
@@ -14,6 +15,7 @@ env.Append(
         Dir("u8g2"),
         Dir("update_util"),
         Dir("print"),
+        Dir("pulse_reader"),
     ],
 )
 
@@ -93,6 +95,7 @@ libs = env.BuildModules(
         "mbedtls",
         "subghz",
         "nfc",
+        "pulse_reader",
         "appframe",
         "misc",
         "lfrfid",