Sort Day list and CalorieManager list

[hoperawr]

When adding a new day or editing an existing day, the day is added into the list in chronological order. However, I think we should not allow users to edit the date of the day as it does not make much sense.

Did the same thing for CalorieManager so that when inputs or outputs are added, they are in order of time.

[codecov-io]

Codecov Report

Merging #103 into master will increase coverage by 0.37%.
The diff coverage is 90.32%.

@@             Coverage Diff              @@
##             master     #103      +/-   ##
============================================
+ Coverage     59.77%   60.15%   +0.37%     
- Complexity      453      467      +14     
============================================
  Files            91       91              
  Lines          1678     1709      +31     
  Branches        172      183      +11     
============================================
+ Hits           1003     1028      +25     
- Misses          597      598       +1     
- Partials         78       83       +5     

Impacted Files	Coverage Δ	Complexity Δ
...ain/java/seedu/address/model/day/calorie/Time.java	91.66% <0.00%> (+0.75%)	7.00 <1.00> (+2.00)
...eedu/address/model/day/calorie/CalorieManager.java	96.07% <87.50%> (-3.93%)	16.00 <6.00> (+4.00)	⬇️
src/main/java/seedu/address/model/day/Date.java	87.50% <100.00%> (+0.83%)	8.00 <1.00> (+1.00)
src/main/java/seedu/address/model/day/Day.java	97.43% <100.00%> (+0.06%)	17.00 <1.00> (+1.00)
...in/java/seedu/address/model/day/UniqueDayList.java	72.72% <100.00%> (-1.70%)	20.00 <0.00> (+4.00)	⬇️
...in/java/seedu/address/model/day/calorie/Input.java	27.27% <100.00%> (+3.46%)	3.00 <1.00> (+1.00)
...n/java/seedu/address/model/day/calorie/Output.java	27.27% <100.00%> (+3.46%)	3.00 <1.00> (+1.00)
src/main/java/seedu/address/model/tag/Tag.java	70.00% <0.00%> (-10.00%)	4.00% <0.00%> (-1.00%)
.../java/seedu/address/model/day/calorie/Calorie.java	100.00% <0.00%> (+16.66%)	3.00% <0.00%> (+1.00%)

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