shardtree: Switch from `Rc` to `Arc` to make trees `Send` #358

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Run time

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Job	Run time
Rustfmt	14s
Intra-doc links	1m 23s
Bitrot check	2m 11s
Test on ubuntu-latest	2m 16s
Test on windows-latest	2m 16s
Test on macOS-latest	2m 28s
	10m 48s