Convert attribute and dimension names to strings when generating HTML repr #5149
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The standard repr() already handled non-string attribute names, but the HTML formatter failed when trying to escape HTML entitites in non-string names. This just calls str() before escape(). It also includes tests for Dataset, DataArray and Variable.
Reported in #5146.
Note that there may be a need to do the same for dimension names if they are allowed to be strings. Currently dimensions must be created as strings but can later be renamed to non-strings, see #5148.Dimensions can be non-str, updated.pre-commit run --all-files