feat: add models for module timing

[blaukc]

Added the module timing which has the day, start time and end time

[codecov]

Codecov Report

Attention: Patch coverage is 2.77778% with 35 lines in your changes are missing coverage. Please review.

Project coverage is 65.67%. Comparing base (c981d98) to head (9ff156c).

❗ Current head 9ff156c differs from pull request most recent head 9330d00. Consider uploading reports for the commit 9330d00 to get more accurate results

Files	Patch %	Lines
src/main/java/seedu/address/model/module/Day.java	0.00%	12 Missing ⚠️
...c/main/java/seedu/address/model/module/Timing.java	0.00%	12 Missing ⚠️
.../java/seedu/address/model/module/ModuleTiming.java	0.00%	11 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##             master      #52      +/-   ##
============================================
- Coverage     67.10%   65.67%   -1.43%     
  Complexity      433      433              
============================================
  Files            83       86       +3     
  Lines          1584     1620      +36     
  Branches        150      150              
============================================
+ Hits           1063     1064       +1     
- Misses          486      521      +35     
  Partials         35       35              

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[taufiq]

lgtmag

[yadunut]

LGTM!

[AdityaB4]

LGTM!