update sterescope + add json presenter

imgbom/presenter/json/test-fixtures/image-simple/Dockerfile

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+# Note: changes to this file will result in updating several test values. Consider making a new image fixture instead of editing this one.
+FROM scratch
+ADD file-1.txt /somefile-1.txt
+ADD file-2.txt /somefile-2.txt
+# note: adding a directory will behave differently on docker engine v18 vs v19
+ADD target /

imgbom/presenter/json/test-fixtures/image-simple/file-1.txt

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+this file has contents

imgbom/presenter/json/test-fixtures/image-simple/file-2.txt

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+file-2 contents!

imgbom/presenter/json/test-fixtures/image-simple/target/really/nested/file-3.txt

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+another file!
+with lines...

imgbom/presenter/json/test-fixtures/snapshot/TestJsonPresenter.golden

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+{"image":{"layers":[{"mediaType":"application/vnd.docker.image.rootfs.diff.tar.gzip","digest":"sha256:056c0789fa9ad629ceae6d09713fb035f84115af3c4a88a43aa60f13bc683053","size":22},{"mediaType":"application/vnd.docker.image.rootfs.diff.tar.gzip","digest":"sha256:b461c48116592c570a66fed71d5b09662a8172e168b7938cf317af47872cdc9b","size":16},{"mediaType":"application/vnd.docker.image.rootfs.diff.tar.gzip","digest":"sha256:00b80053e05c01da485015610d288ce3185fac00d251e2ada02b45a7a7c5f589","size":27}],"size":65,"digest":"sha256:3c53d2d891940f8d8e95acb77b58752f54dc5de9d91d19dd90ced2db76256cea","mediaType":"application/vnd.docker.distribution.manifest.v2+json","tags":["anchore-fixture-image-simple:04e16e44161c8888a1a963720fd0443cbf7eef8101434c431de8725cd98cc9f7"]},"artifacts":[{"name":"package-1","version":"1.0.1","type":"deb","analyzer":"TODO","sources":[{"source":"","layer":0,"effects":[]}],"metadata":null},{"name":"package-2","version":"2.0.1","type":"deb","analyzer":"TODO","sources":[{"source":"","layer":1,"effects":[]}],"metadata":null}]}