Add support for timestamp encoding in exemplars #941

Job	Run time
Test Suite	2m 28s
Check	1m 52s
Clippy	1m 11s
Check rustdoc intra-doc links	28s
Rustfmt	22s
Cross compile (powerpc-unknown-linux-gnu)	21s
Cross compile (wasm32-unknown-unknown)	20s
Cross compile (armv7-unknown-linux-gnueabihf)	20s
Cross compile (powerpc64-unknown-linux-gnu)	22s
	7m 44s

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