Add shorthands in SuggestionCommandParser and SuggestionEngineImpl

[johannagwan]

Closes #285

[codecov[bot]]

Codecov Report

Merging #429 into master will decrease coverage by 0.03%. The diff coverage is 83.33%.

@@             Coverage Diff              @@
##             master     #429      +/-   ##
============================================
- Coverage     65.61%   65.57%   -0.04%     
  Complexity      535      535              
============================================
  Files            98       98              
  Lines          2146     2147       +1     
  Branches        205      206       +1     
============================================
  Hits           1408     1408              
  Misses          658      658              
- Partials         80       81       +1     

Impacted Files	Coverage Δ	Complexity Δ
...rser/suggestion/DeleteSuggestionCommandParser.java	95.65% <ø> (ø)	5.00 <0.00> (ø)
...parser/suggestion/EditSuggestionCommandParser.java	100.00% <ø> (ø)	2.00 <0.00> (ø)
...parser/suggestion/HelpSuggestionCommandParser.java	100.00% <ø> (ø)	2.00 <0.00> (ø)
.../parser/suggestion/NewSuggestionCommandParser.java	80.95% <ø> (ø)	6.00 <0.00> (ø)
...parser/suggestion/OpenSuggestionCommandParser.java	95.65% <ø> (ø)	5.00 <0.00> (ø)
...rser/suggestion/SearchSuggestionCommandParser.java	92.85% <ø> (ø)	4.00 <0.00> (ø)
...notably/logic/suggestion/SuggestionEngineImpl.java	84.61% <83.33%> (-2.23%)	15.00 <0.00> (ø)

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