Add support for timestamp encoding in exemplars #957

Job	Run time
Clippy	1m 16s
Test Suite	1m 57s
Rustfmt	19s
Check	1m 44s
Cross compile (powerpc-unknown-linux-gnu)	21s
Cross compile (powerpc64-unknown-linux-gnu)	21s
Check rustdoc intra-doc links	32s
Cross compile (armv7-unknown-linux-gnueabihf)	19s
Cross compile (wasm32-unknown-unknown)	24s
	7m 13s

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