interoperability for Stipple.JSONText and JSON.JSONText #523

Job	Run time
build	2m 32s
Julia 1.6 - ubuntu-latest - x64	4m 22s
Julia 1.6 - macOS-latest - x64	4m 24s
Julia 1.6 - windows-latest - x64	14m 0s
Julia 1.7 - ubuntu-latest - x64	3m 15s
Julia 1.7 - macOS-latest - x64	3m 3s
Julia 1.7 - windows-latest - x64	4m 27s
Julia nightly - ubuntu-latest - x64	4m 11s
Julia nightly - macOS-latest - x64	5m 57s
Julia nightly - windows-latest - x64	5m 35s
	51m 46s

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