Split the retrieve testcases command

[qryxip]

No description provided.

[codecov-commenter]

Codecov Report

Merging #3 into master will not change coverage.
The diff coverage is 0.00%.

@@           Coverage Diff           @@
##           master      #3    +/-   ##
=======================================
  Coverage    0.00%   0.00%            
=======================================
  Files          16      20     +4     
  Lines        2096    2213   +117     
  Branches      979    1019    +40     
=======================================
- Misses       2086    2200   +114     
- Partials       10      13     +3     

Impacted Files	Coverage Δ
src/commands/new.rs	0.00% <0.00%> (ø)
src/commands/open.rs	0.00% <0.00%> (ø)
src/commands/retrieve_testcases.rs	0.00% <0.00%> (ø)
src/commands/submit.rs	0.00% <0.00%> (ø)
src/lib.rs	0.00% <0.00%> (ø)
src/open.rs	0.00% <0.00%> (ø)
src/project.rs	0.00% <0.00%> (ø)
src/testing.rs	0.00% <0.00%> (ø)
src/web/mod.rs	0.00% <ø> (ø)
src/web/retrieve_testcases.rs	0.00% <0.00%> (ø)
... and 6 more

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[qryxip]

bors r+

[bors]

Build succeeded:

• grcov
• Rustfmt
• stable-x86_64-apple-darwin
• stable-x86_64-pc-windows-msvc
• stable-x86_64-unknown-linux-gnu