Add support for async templates #6017
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_.template can be configured to output an async compiled template, by setting options.isAsync to true. _.template itself remains non-async.
This can be useful for users who want to use await inside the template.
Default behavior is unchanged, ie. isAsync defaults to false.
Some tests are added too. Some examples too (in the jsdoc for _.template).
EJS already supports this feature.
I made the change to use it myself for a project and figured someone else might want it too.