Branch efficiency

[howen02]

Implement efficiency metrics and UI changes.

[yiwern5]

LGTM

[codecov]

Codecov Report

Attention: Patch coverage is 71.83099% with 20 lines in your changes are missing coverage. Please review.

Project coverage is 73.51%. Comparing base (31cd0de) to head (fffa4e8).

Files	Patch %	Lines
...in/java/seedu/address/model/person/Efficiency.java	50.00%	7 Missing ⚠️
.../java/seedu/address/model/util/SampleDataUtil.java	0.00%	6 Missing ⚠️
...in/java/seedu/address/logic/parser/ParserUtil.java	60.00%	1 Missing and 1 partial ⚠️
src/main/java/seedu/address/model/task/Task.java	75.00%	2 Missing ⚠️
...in/java/seedu/address/storage/JsonAdaptedTask.java	66.66%	1 Missing and 1 partial ⚠️
src/main/java/seedu/address/ui/PersonCard.java	0.00%	1 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##             master      #59      +/-   ##
============================================
- Coverage     73.59%   73.51%   -0.08%     
- Complexity      494      503       +9     
============================================
  Files            84       85       +1     
  Lines          1632     1680      +48     
  Branches        161      166       +5     
============================================
+ Hits           1201     1235      +34     
- Misses          373      385      +12     
- Partials         58       60       +2     

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