Add support for timestamp encoding in exemplars #948

Job	Run time
Check	1m 34s
Test Suite	1m 37s
Rustfmt	17s
Clippy	1m 51s
Check rustdoc intra-doc links	31s
Cross compile (wasm32-unknown-unknown)	21s
Cross compile (armv7-unknown-linux-gnueabihf)	24s
Cross compile (powerpc64-unknown-linux-gnu)	23s
Cross compile (powerpc-unknown-linux-gnu)	19s
	7m 17s

Provide feedback