feat [CE-792] adds limit, search_after and search_before params on BE endpoints

[juanolmedo1]

CE-792

Changes

• Added support to the next param in all BE API list methods
• Set default value null on all params (limit, next, search_after and search_before).
• List endpoints related to rewards supports only limit and next params (search after and search before are not supported by the API)
• Refactored old _getTransactionSearchPathAndParams with new private method buildRequestParams: receives an object instead of multiple params.
• Removed unused _formatDate function.
• sentOnly /sent and receivedOnly /received are handled in the calling function

[juandavidkincaid]

Aren't there any other places in which those parameters exists? or should exist? only on the BlockExplorerV2Api?

[juandavidkincaid]

Old snapshots might not contain all new/recent fields, update types to reflect this. Besides that everything else looks fine.