pagination

[stolarczyk]

@xuebingjie1990, this is the finalized pagination implementation. I decided to put these changes to this feature branch, not dev so that you can test them with the UI and see if these are breaking changes before merging.

Important things to note:

• update pipestat before testing
• the default for limit query param is: 100
• the default for offset query param is: 0
• limit query param is restricted to be in range: (0, 100]
• offset query param is restricted to be larger than 0

[nsheff]

We implemented cursor-based paging in the new version, so this is no longer needed.