#4732 - Limit the amount of items for metastore schema API request

[stefan-korn]

Fixes #4732

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• I have updated or added tests to cover my code
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[dafeder]

I talked about this on the issue comments but:

• I think if we introduce limit we should also have offset, so that people can paginate through results. However, I'm open to breaking that off for a second issue if you feel it's scope creep.
• I think the name of the method is a little confusing. I'd suggest limitItems() - it's more concise, and makes it clear that we're applying a limit not just determining whether a limit should be there (which I'd expect to return a bool)
• Can't merge without test coverage for limits