Fix #638 and #639: treat single column unique indexes as primary key#640

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hhowe29 wants to merge 2 commits intosequelize:masterfrom

hhowe29:treat_unique_index_as_primary_key

Commits on Mar 11, 2023

Make assertion errors in build.test fail the test if they occur. Treat single column unique indexes as a primary key if no other primary key was found. Fixes #638 and implement #639.
hhowe29
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Require that the unique column not allow nulls #639.
hhowe29
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