Make FreeRTOS a first-class citizen, enable multithread, multicore TCP/IP #2908

Job	Run time
Spelling, Style, Boards, Package, PIO	35s
Build 0	1m 4s
Windows	2m 41s
Build 2	1m 15s
Build 1	1m 18s
Build 5	1m 5s
Build 4	1m 3s
Build 3	1m 19s
Build PlatformIO Examples	1m 32s
Mac (macOS-14)	2m 19s
Build Every Variant 0	1m 6s
Mac (macOS-13)	2m 5s
Build Every Variant 1	1s
Build RP2350 4	57s
Build RP2350 3	1m 12s
Build RP2350-RISCV 0	1m 11s
Build RP2350-RISCV 1	1m 24s
Build TinyUSB Examples	1m 19s
Build RP2350 2	59s
Build RP2350-RISCV 4	1m 23s
Build RP2350 1	45s
Build RP2350 5	43s
Build RP2350 0	42s
Build RP2350-RISCV 5	1s
Build RP2350-RISCV 3	1m 15s
Build RP2350-RISCV 2	1s
	29m 15s

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