Improve abstraction within classes related to bookmark transactions feature

[siddarth2824]

Resolves #290. Resolves #292, resolves #293.

Changes made:

• Abstracted out the parsing logic for DeleteBookmarkExpenseCommandParser and DeleteBookmarkIncomeCommandParser by creating a DeleteBookmarkTransactionCommandParser class.
• Abstracted out the parsing logic for EditBookmarkExpenseCommandParser and EditBookmarkIncomeCommandParser by creating a EditBookmarkTransactionCommandParser class.
• Abstracted out the parsing logic for ConvertBookmarkExpenseCommandParser snd ConvertBookmarkIncomeCommandParser by creating a ConvertBookmarkTransactionCommandParser class.
• Abstracted out the main parsing logic for AddBookmarkExpenseCommandParser and AddBookmarkIncomeCommandParser by creating a BookmarkTransactionBuilder class which is a utility class that parses the input arguments and create a BookmarkIncome and BookmarkExpense respectively.

[codecov-io]

Codecov Report

Merging #291 (b9be9e3) into master (d726aac) will increase coverage by 0.09%. The diff coverage is 93.98%.

@@             Coverage Diff              @@
##             master     #291      +/-   ##
============================================
+ Coverage     88.04%   88.14%   +0.09%     
  Complexity      942      942              
============================================
  Files           119      117       -2     
  Lines          2343     2311      -32     
  Branches        325      318       -7     
============================================
- Hits           2063     2037      -26     
+ Misses          173      168       -5     
+ Partials        107      106       -1     

Impacted Files	Coverage Δ	Complexity Δ
...ic/commands/bookmark/AddBookmarkIncomeCommand.java	84.61% <ø> (ø)	7.00 <0.00> (ø)
..._3/finesse/model/bookmark/BookmarkTransaction.java	100.00% <ø> (ø)	5.00 <0.00> (ø)
.../commands/bookmark/EditBookmarkExpenseCommand.java	86.66% <71.42%> (-1.22%)	8.00 <1.00> (-2.00)
...c/commands/bookmark/EditBookmarkIncomeCommand.java	86.66% <71.42%> (-1.22%)	8.00 <1.00> (-2.00)
...mmands/bookmark/ConvertBookmarkExpenseCommand.java	94.11% <83.33%> (-0.89%)	7.00 <1.00> (-1.00)
...ommands/bookmark/ConvertBookmarkIncomeCommand.java	94.11% <83.33%> (-0.89%)	7.00 <1.00> (-1.00)
..._cs2103_w16_3/finesse/logic/parser/ParserUtil.java	95.52% <92.00%> (-2.10%)	27.00 <9.00> (+10.00)	:arrow_down:
...ogic/commands/bookmark/ConvertBookmarkCommand.java	100.00% <100.00%> (ø)	9.00 <9.00> (+8.00)
...logic/commands/bookmark/DeleteBookmarkCommand.java	100.00% <100.00%> (ø)	7.00 <7.00> (+6.00)
...ommands/bookmark/DeleteBookmarkExpenseCommand.java	100.00% <100.00%> (ø)	7.00 <1.00> (ø)
... and 18 more

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