Implement parser support and functionality for updating the sales of drink items

[ureshiiYing]

Implementing parser support first serves as foundation to implement the sales command feature, which updates and tracks the sales of drinks.

Functionality of updating drink sales has also been implemented. There are 6 drink types that the user can update.

However, these data are only stored in memory and has not been implemented to be stored locally. The UI for sales tracking has also not been implemented. Currently, the ResultDisplay is used to show the sales data.

[codecov-io]

Codecov Report

❗ No coverage uploaded for pull request base (master@6e8aa44). Click here to learn what that means.
The diff coverage is 94.25%.

@@            Coverage Diff            @@
##             master      #65   +/-   ##
=========================================
  Coverage          ?   73.92%           
  Complexity        ?      434           
=========================================
  Files             ?       74           
  Lines             ?     1308           
  Branches          ?      131           
=========================================
  Hits              ?      967           
  Misses            ?      309           
  Partials          ?       32           

Impacted Files	Coverage Δ	Complexity Δ
src/main/java/seedu/address/MainApp.java	0.00% <0.00%> (ø)	0.00 <0.00> (?)
src/main/java/seedu/address/model/Model.java	100.00% <ø> (ø)	1.00 <0.00> (?)
...rc/main/java/seedu/address/model/ModelManager.java	96.42% <83.33%> (ø)	27.00 <4.00> (?)
src/main/java/seedu/address/model/SalesBook.java	96.29% <96.29%> (ø)	15.00 <15.00> (?)
...edu/address/logic/commands/SalesUpdateCommand.java	100.00% <100.00%> (ø)	6.00 <6.00> (?)
.../seedu/address/logic/parser/AddressBookParser.java	100.00% <100.00%> (ø)	13.00 <0.00> (?)
...ain/java/seedu/address/logic/parser/CliSyntax.java	91.66% <100.00%> (ø)	1.00 <0.00> (?)
...address/logic/parser/SalesUpdateCommandParser.java	100.00% <100.00%> (ø)	6.00 <6.00> (?)
src/main/java/seedu/address/model/Drink.java	100.00% <100.00%> (ø)	2.00 <2.00> (?)

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[yanbingtao]

LGTM

[Persdre]

LGTM

[yanbingtao]

LGTM