Implement rest of DataConsumerAgent, unskip its tests

[trentmc]

Is your feature request related to a problem? Please describe.

From Ocean v3 netlist, here is
DataconsumerAgent's functionality. It has two key functions: buyDT() and consumeDT().

The commit 79c52eb fleshed out buyDT(), for the most part. But there's more to do, see below.

Describe the solution you'd like

• buyDT(): implement proper tests, make changes until tests pass
• consumeDT(): implement consumeDT(), implement tests, make changes until tests pass

[trentmc]

Hi @nvtrang91. An update...

1. I checked your PR locally. Both tests failed, there were two bugs. I fixed them. I don't know why they didn't show up in the hacking session yesterday. Nonetheless, all good now. I just merged your PR.

2. I went back to confirm that everything is done for DataconsumerAgent. And I realized that there is more to go: buyDT() was one part, but we still need consumeDT(). The Ocean V3 netlist makes it clear. I updated the issue accordingly, including showing exactly what's DataconsumerAgent does.

For (2), @nvtrang91 would you like to take a swing at consumeDT() ? In the netlist image, you can see its inputs and outputs, just like there are inputs and outputs displayed for buyDT().

[trangnv]

Hi @trentmc,
Totally forgot about consumeDT too, I'll work on that for the next session.
Cheers.