Integrate Priority into Person Class to enable support for Priority

Codecov Report

Attention: Patch coverage is 92.00000% with 2 lines in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
src/main/java/seedu/address/ui/PersonCard.java	0.00%	2 Missing :warning:

Files with missing lines	Coverage Δ	Complexity Δ
...a/seedu/address/logic/commands/AddApptCommand.java	`84.21% <100.00%> (+0.28%)`	`11.00 <0.00> (ø)`
...java/seedu/address/logic/commands/EditCommand.java	`90.74% <100.00%> (+0.08%)`	`12.00 <0.00> (ø)`
.../seedu/address/logic/commands/PriorityCommand.java	`96.29% <100.00%> (+37.03%)`	`11.00 <0.00> (+3.00)`
...a/seedu/address/logic/parser/AddCommandParser.java	`100.00% <100.00%> (ø)`	`6.00 <0.00> (ø)`
...in/java/seedu/address/logic/parser/ParserUtil.java	`74.02% <100.00%> (ø)`	`23.00 <0.00> (ø)`
...du/address/logic/parser/PriorityCommandParser.java	`100.00% <ø> (ø)`	`4.00 <0.00> (ø)`
...c/main/java/seedu/address/model/person/Person.java	`98.24% <100.00%> (+2.01%)`	`29.00 <2.00> (+3.00)`
...main/java/seedu/address/model/person/Priority.java	`93.33% <100.00%> (+18.33%)`	`10.00 <1.00> (+3.00)`
.../java/seedu/address/model/util/SampleDataUtil.java	`25.92% <ø> (ø)`	`3.00 <0.00> (ø)`
.../java/seedu/address/storage/JsonAdaptedPerson.java	`96.55% <100.00%> (-0.98%)`	`19.00 <0.00> (ø)`
... and 1 more