[Proof of Concept] `Polyester.@batch` for threading #1077

Job	Run time
Documentation	1m 56s
Julia 1.6 - ubuntu-latest - x64 - pull_request	5m 53s
Julia 1.6 - macOS-latest - x64 - pull_request	15m 48s
Julia 1.6 - windows-latest - x64 - pull_request	18m 10s
Julia ^1.6 - ubuntu-latest - x64 - pull_request	4m 8s
Julia ^1.6 - macOS-latest - x64 - pull_request	6m 32s
Julia ^1.6 - windows-latest - x64 - pull_request	6m 17s
	58m 44s

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