Add Claim Object

[RezwanAhmed123]

Claim object does not exist and it is hard to pack all these data about claims together without abstraction.

Let's create a claim object to Insurance Plan object and format the error messages to not be magic literals.

This will make further development easier.

[codecov[bot]]

Codecov Report

Attention: Patch coverage is 9.58904% with 66 lines in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
...du/address/logic/parser/AddClaimCommandParser.java	0.00%	15 Missing :warning:
...du/address/model/person/insurance/claim/Claim.java	0.00%	15 Missing :warning:
.../seedu/address/logic/commands/AddClaimCommand.java	0.00%	14 Missing :warning:
...in/java/seedu/address/logic/parser/ParserUtil.java	0.00%	11 Missing :warning:
.../model/person/insurance/InsurancePlansManager.java	11.11%	8 Missing :warning:
src/main/java/seedu/address/logic/Messages.java	0.00%	2 Missing :warning:
.../seedu/address/logic/parser/AddressBookParser.java	0.00%	1 Missing :warning:

Files with missing lines	Coverage Δ	Complexity Δ
...du/address/logic/commands/AddInsuranceCommand.java	21.42% <ø> (ø)	3.00 <0.00> (ø)
...ain/java/seedu/address/logic/parser/CliSyntax.java	88.88% <100.00%> (+3.17%)	1.00 <0.00> (ø)
.../address/model/person/insurance/InsurancePlan.java	87.50% <100.00%> (+4.16%)	6.00 <0.00> (ø)
.../seedu/address/logic/parser/AddressBookParser.java	91.30% <0.00%> (-8.70%)	14.00 <0.00> (ø)
src/main/java/seedu/address/logic/Messages.java	80.00% <0.00%> (-8.89%)	3.00 <0.00> (ø)
.../model/person/insurance/InsurancePlansManager.java	65.21% <11.11%> (-13.17%)	15.00 <0.00> (ø)
...in/java/seedu/address/logic/parser/ParserUtil.java	73.58% <0.00%> (-19.28%)	15.00 <0.00> (ø)
.../seedu/address/logic/commands/AddClaimCommand.java	0.00% <0.00%> (ø)	0.00 <0.00> (?)
...du/address/logic/parser/AddClaimCommandParser.java	0.00% <0.00%> (ø)	0.00 <0.00> (?)
...du/address/model/person/insurance/claim/Claim.java	0.00% <0.00%> (ø)	0.00 <0.00> (?)

[RezwanAhmed123]

refer to PR #101