UART: Change default Serial1/2 pins and move definition to header

[lucasssvaz]

Description of Change

This PR aims to change the default UART1 and UART2 pins to avoid conflicts and improve ease of use.
It also moves the pin definitions to the HardwareSerial.h file so they can be used in sketches.
The final pin assignments are:

	Name	ESP32	S2	S3	C3	C6	H2
UART0 RX	SOC_RX0	3	44	44	20	17	23
UART0 TX	SOC_TX0	1	43	43	21	16	24
UART1 RX	RX1	26	4	15	18	4	0
UART1 TX	TX1	27	5	16	19	5	1
UART2 RX	RX2	4	--	19	--	--	--
UART2 TX	TX2	25	--	20	--	--	--

Tests scenarios

Tested all chips using the (future) UART CI script.

[P-R-O-C-H-Y]

Looks good. LGTM

[me-no-dev]

this looks good, but brings another task on mind. Have definitions for default pins in another header in the core, so when we add new chips, we have one file to update and we do not forget something.

[lucasssvaz]

this looks good, but brings another task on mind. Have definitions for default pins in another header in the core, so when we add new chips, we have one file to update and we do not forget something.

Should I do that in this PR ?

[me-no-dev]

Should I do that in this PR ?

let's make it separate task, since it covers more than Serial.