Update filter group

[STELLA-LYE]

Update feature to filter strictly according to group.

[codecov]

Codecov Report

Attention: Patch coverage is 95.00000% with 2 lines in your changes are missing coverage. Please review.

Project coverage is 77.80%. Comparing base (a1a2dd0) to head (831d3b7).
Report is 12 commits behind head on master.

Files	Patch %	Lines
...eedu/address/logic/parser/FilterCommandParser.java	80.00%	1 Missing and 1 partial ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##             master      #45      +/-   ##
============================================
+ Coverage     77.49%   77.80%   +0.31%     
- Complexity      461      478      +17     
============================================
  Files            74       77       +3     
  Lines          1462     1505      +43     
  Branches        144      149       +5     
============================================
+ Hits           1133     1171      +38     
- Misses          296      300       +4     
- Partials         33       34       +1     

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[jocelyn-soh]

LGTM