Add additional commands for Frequent Income feature

[siddarth2824]

Resolves #158.
Resolves #159.
Resolves #160.

Changes:

• Added EditFrequentIncomeCommand for users to edit existing frequent incomes
• Added DeleteFrequentIncomeCommand for users to delete existing frequent incomes
• Added ConvertFrequentIncomeCommand for users to convert the specified frequent income and add it to the finance trackers as an income
• Added parsers for the above mentioned commands to validate user inputs
• Added tests for:
  • EditFrequentIncomeCommand
  • DeleteFrequentIncomeCommand
  • ConvertFrequentIncomeCommand
  • EditFrequentIncomrCommandParser
  • DeletetFrequentIncomrCommandParser
  • ConvertFrequentIncomrCommandParser

Future Work:

• Restrict users from utilising EditFrequentIncomeCommand, DeleteFrequentIncomeCommand and ConvertFrequentIncomeCommandonly under the Income tab

[codecov-io]

Codecov Report

Merging #166 into master will increase coverage by 1.31%.
The diff coverage is 94.57%.

@@             Coverage Diff              @@
##             master     #166      +/-   ##
============================================
+ Coverage     74.76%   76.08%   +1.31%     
- Complexity      701      770      +69     
============================================
  Files           124      131       +7     
  Lines          2128     2262     +134     
  Branches        226      242      +16     
============================================
+ Hits           1591     1721     +130     
+ Misses          448      447       -1     
- Partials         89       94       +5     

Impacted Files	Coverage Δ	Complexity Δ
...s1_cs2103_w16_3/finesse/commons/core/Messages.java	0.00% <ø> (ø)	0.00 <0.00> (ø)
...mmands/frequent/ConvertFrequentExpenseCommand.java	95.00% <ø> (ø)	8.00 <0.00> (ø)
...6_3/finesse/logic/parser/FinanceTrackerParser.java	81.03% <0.00%> (-4.43%)	31.00 <0.00> (ø)
...ava/ay2021s1_cs2103_w16_3/finesse/model/Model.java	100.00% <ø> (ø)	5.00 <0.00> (+1.00)
...equentparsers/EditFrequentIncomeCommandParser.java	91.30% <91.30%> (ø)	9.00 <9.00> (?)
...c/commands/frequent/EditFrequentIncomeCommand.java	93.33% <93.33%> (ø)	10.00 <10.00> (?)
...ommands/frequent/ConvertFrequentIncomeCommand.java	95.00% <95.00%> (ø)	8.00 <8.00> (?)
...ds/frequent/EditFrequentTransactionDescriptor.java	95.83% <95.83%> (ø)	16.00 <16.00> (?)
...commands/frequent/DeleteFrequentIncomeCommand.java	100.00% <100.00%> (ø)	7.00 <7.00> (?)
.../commands/frequent/EditFrequentExpenseCommand.java	93.33% <100.00%> (-1.12%)	10.00 <1.00> (ø)
... and 16 more

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[wltan]

I don't think it is good from a UX perspective that the user is able to convert incomes (and expenses also) from a list that is not even visible to them.

What I envision is that these commands should be restricted to their respective tabs (as is the case for edit and delete currently). Then, we can add a generic command that is simpler to use (also the case for edit and delete currently).

But that can be addressed in a future issue. The logic behind the commands LGTM!

Edit: You may want to check if #158, #159, #160 should be tagged type.story instead.

[wltan]

LGTM