feat: add `max-items`, improve list endpoints performance

[mwwoda]

Added max-items flag that could be used to limit number of items returned by list endpoints. Most of them should support this flag. Improved performance of list endpoints by providing limit of 1000 by default (instead of 100 which is used by the backend if no limit is provided).

Tests for GetFolderItems for 11k records Before: avg 133s After: avg 85s

[coveralls]

Pull Request Test Coverage Report for Build 5044056613

• 90 of 90 (100.0%) changed or added relevant lines in 32 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage increased (+0.2%) to 86.339%

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Totals
Change from base Build 5000546676:	0.2%
Covered Lines:	4052
Relevant Lines:	4548

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💛 - Coveralls