tools: add clangd support #4688

Job	Run time
RT-Thread Online Packages (STM32F407 RT-Spark)	7m 0s
RTduino/Arduino Libraries (STM32F412 Nucleo)	12m 0s
RTduino/Arduino Libraries (Raspberry Pico)	16m 20s
others_at32_hc32_ht32	7m 15s
stm32l4_f0_f1	13m 17s
stm32_f2_f4	8m 24s
stm32_f7_g0_h7_mp15_u5_h5_wb5	5m 49s
nxp_renesas	6m 4s
nuvoton	5m 33s
gd32_n32_apm32	6m 42s
Infineon_TI_microchip	7m 4s
mips	2m 41s
aarch64	5m 33s
riscv-none	3m 10s
riscv64-unknown	4m 21s
hpmicro	3m 36s
llvm-arm	6m 20s
simulator	2m 34s
ESP32C3	23m 7s
i386-unknown	2m 24s
nordic(yml)	13m 8s
	2h 42m 22s

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