AIP #61 v5: GET /channel/:id/spender/all

[elpiel]

https://github.com/AdExNetwork/aips/issues/61

Related to #391 as this should return all spenders limits

• Route impl Issue 392 get all spenders info #424
• Pagination of response Added Pagination, added created field to Spendable, added limit to config #441

[elpiel]

There are a few tests that still need to be done for the pagination. Please refer to this PR comment:

#441 (review)

[elpiel]

TODOs

• validator_worker::sentry_interface::SentryApi::get_all_spenders to use the paginated responses Remaining spender all tests #451

(from #441 (review)):

Make sure to make test that covers:

• 0 records
• less than 1 page of records
• 2 pages of records

This way we can test if queries are correct and returning the expected results

Make sure to write tests for the pagination in Sentry to:

• Check page count Remaining spender all tests #451
• Check ordering & Records Remaining spender all tests #451