Add cachemeta function with execution metadata tracking #53

Job	Run time
Julia 1.0 - macOS-latest - x64	5m 47s
Julia 1.3 - windows-latest - x64	7m 23s
Julia nightly - windows-latest - x64	3m 50s
Julia 1.3 - ubuntu-latest - x64	2m 28s
Julia nightly - macOS-latest - x64	6m 57s
Julia 1.3 - macOS-latest - x64	7m 27s
Julia 1.0 - windows-latest - x64	5m 46s
Julia 1.0 - ubuntu-latest - x64	2m 39s
Julia nightly - ubuntu-latest - x64	3m 7s
	45m 24s

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