Add function to find Appointments by ICs of those involved

[chonguschonguschongus]

Add functionality of searching appointments by NRICs of those involved. NRIC used in query IS case sensitive. Only one NRIC can be searched with at a time.

Make minor adjustment to Ui: Appointments column is thinner and text wrapping is enabled for it.

Moving forwards, not sure if we are implmenting an AppointmentTime class for an AppointmentTime field belonging to the Appointment class. Doing so will make it much easier to implement a search by Day and Time feature.

[codecov]

Codecov Report

Merging #151 (053aa58) into master (ddf47f6) will decrease coverage by 0.22%.
The diff coverage is 47.91%.

@@             Coverage Diff              @@
##             master     #151      +/-   ##
============================================
- Coverage     66.58%   66.37%   -0.22%     
- Complexity      629      638       +9     
============================================
  Files           108      111       +3     
  Lines          2466     2513      +47     
  Branches        250      253       +3     
============================================
+ Hits           1642     1668      +26     
- Misses          732      748      +16     
- Partials         92       97       +5     

Files	Coverage Δ
src/main/java/seedu/address/logic/Messages.java	57.14% <ø> (ø)
...java/seedu/address/logic/commands/ListCommand.java	100.00% <100.00%> (ø)
...ress/logic/parser/AddAppointmentCommandParser.java	0.00% <ø> (ø)
...s/logic/parser/DeleteAppointmentCommandParser.java	100.00% <ø> (ø)
...eedu/address/logic/parser/DeleteCommandParser.java	100.00% <ø> (ø)
.../seedu/address/logic/parser/EditCommandParser.java	88.37% <ø> (ø)
.../seedu/address/logic/parser/FindCommandParser.java	100.00% <ø> (ø)
.../address/logic/commands/AddAppointmentCommand.java	0.00% <0.00%> (ø)
.../seedu/address/logic/parser/AddressBookParser.java	75.00% <0.00%> (-2.78%)	⬇️
...ess/logic/parser/FindAppointmentCommandParser.java	91.66% <91.66%> (ø)
... and 3 more

... and 1 file with indirect coverage changes

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[tanveersingh10]

great work!