Add .gitignore file and refactor llcc68 component

- Added a comprehensive .gitignore file to exclude unnecessary files and directories for various platforms and tools.
- Removed the llcc68.cpp source file as part of the refactoring process.
- Updated llcc68.hpp to replace the `init_exti` function declaration with inline interrupt configuration logic.
- Changed `EXTI_PIN` to `EXTI_PINS` for clarity and consistency.
- Refactored the handling of CAD parameters and improved type safety by using `enum class` for `CAD_EXIT_MODE` and `CAD_SYMB`.

src/llcc68.cpp

@@ -1,42 +0,0 @@
-//
-// Created by Kurosu Chan on 2024/1/17.
-//
-#include "llcc68.hpp"
-#include "driver/gpio.h"
-#include "app_const_llcc68.hpp"
-
-constexpr auto ESP_INTR_FLAG_DEFAULT = 0;
-
-namespace app::driver::llcc68 {
-namespace details {
-	uint32_t __tcxo_delay__;
-	transmit_state_t __tx_state__;
-	// TODO: use freeRTOS queue to handle received data
-	bool __dio_flag__ = false;
-}
-
-void init_exti() {
-	constexpr auto isr = [](void *param) {
-		details::__dio_flag__ = true;
-	};
-
-	uint64_t pin_bit_mask = 0;
-	for (const auto pin : EXTI_PIN) {
-		pin_bit_mask |= (1ULL << pin);
-	}
-
-	gpio_config_t io_conf = {
-		.pin_bit_mask = pin_bit_mask,
-		.mode         = GPIO_MODE_INPUT,
-		.pull_up_en   = GPIO_PULLUP_DISABLE,
-		.pull_down_en = GPIO_PULLDOWN_DISABLE,
-		.intr_type    = GPIO_INTR_POSEDGE,
-	};
-	// https://github.com/espressif/esp-idf/blob/v5.3.2/examples/peripherals/gpio/generic_gpio/main/gpio_example_main.c
-	ESP_ERROR_CHECK(gpio_config(&io_conf));
-	gpio_install_isr_service(ESP_INTR_FLAG_DEFAULT);
-	for (const auto pin : EXTI_PIN) {
-		gpio_isr_handler_add(pin, isr, nullptr);
-	}
-}
-}