bugfix/rtc_clk_32k_bootstrap: Fix starting 32k RTC

1. External 32kHz crystal is started for too long or it may not start at all. It is often observed at the first start.
2. At the first start, it is possible that the crystal did not start. And the recorded period was recorded as 0. Which led to a division error by zero during the transition to the deep sleep mode (Maybe somewhere else).
3. Added a unit test to test a new method of oscillation an external crystal.
4. Added a new method of oscillating of an external crystal. The legs of the crystal are fed with a 32 kHz frequency.

The new method eliminates these errors.

Added unit test: `\esp-idf\components\soc\esp32\test\test_rtc_clk.c`: `make TEST_COMPONENTS=soc`
- 8 Test starting external RTC crystal. Will pass.

`Bootstrap cycles for external 32kHz crystal` - is specified in the file Kconfig by default 100.

QA tested a new method of oscillation the crystal on 25 boards. The supply of square waves on the crystal showed a 100% result in contrast to the previous method of launching the crystal. After the tests, the old method was deleted.

Closes TW19143

components/esp32/Kconfig

@@ -700,6 +700,16 @@ config ESP32_RTC_CLK_CAL_CYCLES
         - 150000 Hz if internal RC oscillator is used as clock source
         - 32768 Hz if the 32k crystal oscillator is used
 
+config ESP32_RTC_XTAL_BOOTSTRAP_CYCLES
+    int "Bootstrap cycles for external 32kHz crystal"
+    default 100
+    range 0 32768
+    help
+        To reduce the startup time of an external RTC crystal, 
+        we bootstrap it with a 32kHz square wave for a fixed number of cycles. 
+        Setting 0 will disable bootstrapping (if disabled, the crystal may take 
+        longer to start up or fail to oscillate under some conditions).
+
 config ESP32_DEEP_SLEEP_WAKEUP_DELAY
     int "Extra delay in deep sleep wake stub (in us)"
     default 2000