Wrong type for onComplete when called with rowFormat: 'object'

[platypii]

The type change in #25 caused a lot of downstream type errors.

Previously in v1.1.1 there was only any[][] types returned to onComplete.

Then in v1.2.0 we updated the type to any[][] | Record<string, any> but any project which was passing an onComplete function with expected type any[][] was throwing a typescript error, and was not easy to fix.

In v1.2.1 I reverted the type change, but left the behavior of rowFormat: 'object' where it will return Record<string, any>[] instead of any[][]. This means the types are not consistent with behavior in that case.

I don't know how I want to fix this yet. But I refuse to break downstream projects that depend on the types.

I think I will start looking at making a new entry point to hyparquet. I want the rows to be returned as a promise instead of a callback. But this may also be a good opportunity to fix the awkwardness of the current parquetRead function.