Add `release-plz` for the 0.2 branch #5423

Job	Run time
Docker Linux Tier1 (i686-unknown-linux-gnu)	3m 22s
Docker Linux Tier1 (x86_64-unknown-linux-gnu)	3m 23s
macOS (x86_64-apple-darwin)	2m 34s
Style check	15s
Windows (x86_64-pc-windows-gnu, 64, x86_64)	3m 57s
Windows (x86_64-pc-windows-msvc)	3m 47s
Windows (i686-pc-windows-msvc)	3m 11s
	20m 29s

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