assert: switch the diff library to go-diff #1546
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Summary
This PR changes the diff library used in the assert package to go-diff.
Changes
the library used for diffing was replaced to go-diff/diffmatchpatch which is actively maintained and enables us to access structured diffs.
Motivation
See the parent PR for more context
difflibis no longer maintained and cannot be extended to modify the diff structure. We end up outputting whatever the library spews without being able to modify it easily. Having the access to the diff structure gives us a more fine-grained control over what we show to users.The initial motivation for this PR was to add colorized diffs to
assert.Equal. Accessing the diff structure would make this task trivialRelated issues
Split from #1480 as per @dolmen's suggestion