Add support for timestamp encoding in exemplars #937

Job	Run time
Rustfmt	22s
Check	1m 38s
Test Suite	1m 54s
Clippy	1m 8s
Cross compile (powerpc64-unknown-linux-gnu)	20s
Check rustdoc intra-doc links	32s
Cross compile (armv7-unknown-linux-gnueabihf)	23s
Cross compile (wasm32-unknown-unknown)	20s
Cross compile (powerpc-unknown-linux-gnu)	19s
	6m 56s

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