Added listtasks command to list open tasks for a user

[mitali31]

'listtasks' command has the following properties:

1. Takes Phabricator username as input and displays the currently open tasks for that user.
2. If no username is provided, their Slack username is used to look up tasks (assumption being that their Slack username matches their Phabricator username).
3. If username is not found, an error message is displayed.

[codecov[bot]]

Codecov Report

Merging #56 into master will decrease coverage by 10.12%. The diff coverage is 14.28%.

@@             Coverage Diff             @@
##           master      #56       +/-   ##
===========================================
- Coverage   27.25%   17.13%   -10.13%     
===========================================
  Files          17       24        +7     
  Lines         521      893      +372     
===========================================
+ Hits          142      153       +11     
- Misses        378      739      +361     
  Partials        1        1

Impacted Files	Coverage Δ
app/modules/core/command_task.go	0% <0%> (ø)
app/modules/core/module.go	0% <0%> (ø)
app/connectors/common.go	100% <100%> (ø)	:arrow_up:
app/modules/core/command_lookup.go	11.62% <17.39%> (ø)
app/controllers/front.go	0% <0%> (ø)	:arrow_up:
app/engine.go	100% <0%> (ø)	:arrow_up:
app/modules/core/command_modules.go	0% <0%> (ø)
app/modules/core/command_summon.go	0% <0%> (ø)
... and 4 more

---

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[schemar]

@mitali31 first of all sorry that no one replied to you for so long! Is this PR still relevant? If so can you please rebase on the latest master? Thanks!

[mitali31]

Yep, it's still relevant.

[schemar]

Thank you @mitali31! Something went wrong when you rebased, so that the changes from master are now listed in the diff. Can you please re-create the PR so that only your changes are listed?

Furthermore, can you please add tests so that your code is covered at least up to the specified target? That would be very nice.

Thank you!

[mitali31]

Sounds good. I'll close this and put up a new PR.

Thanks!

[schemar]

Thank you!