Add esp32c6 examples #344

Job	Run time
build	10s
clippy	4s
fmt	5s
risc-v-esp32c6-rust-example-hello-world	1m 42s
test	5s
xtensa-esp32-rust-example-dynamic-memory	1m 38s
xtensa-esp32-rust-example-hello-world	1m 37s
xtensa-esp32-static-library	1m 43s
xtensa-esp32-rust-example-timer	1m 39s
mips64-rust-example-dynamic-memory	1m 23s
mips64-rust-example-hello-world	1m 17s
risc-v-esp32c6-rust-example-dynamic-memory	1m 42s
risc-v-esp32c6-rust-example-timer	1m 43s
mips64-rust-example-timer	1m 24s
mips64-static-library	1m 21s
xtensa-esp32-c-example	1m 6s
	18m 39s

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