refactor: Code Refactoring of Implementation and Design Smells in Alovoa without any conflicts

[Poojitha1202]

This PR comprises three code smell refactorings each at the implementation and design levels for alovoa.

Implementation Smell Refactoring 1:
Refactoring Technique Name : Extract method
Code Smell: Complex Method
Location :
Path: src/main/java
Package: alovoa/service
Class: RegisterService
Method: registerBase()

Implementation Smell Refactoring 2:
Refactoring Technique Name : Decompose Conditional
Code Smell: Complex Conditional
Location :
Path: src/main/java
Package: alovoa/service
Class: UserService
Method: hasNewMessage()

Implementation Smell Refactoring 3:
Refactoring Technique Name : Introducing Explaining Variable
Refactoring Technique Name: Magic Number
Location :
Path: src/main/java
Package: alovoa/model
Class: UserDto
Method: userToUserDto()

Design Smell Refactoring 1:
Refactoring Technique Name : Extract class
Code Smell: Insufficient modularization
Location :
Path: src/main/java
Package: alovoa/
Class: Tools
New Classes: CountryUtils and ValidationUtils
Dependency Classes Affected: service/MessageService and model/UserDto
Methods: getCountryEmoji() , isURLValid()

Design Smell Refactoring 2:
Refactoring Technique Name : Move Method
Code Smell: Feature Envy
Location :
Path: src/main/java
Package: alovoa/
Class: Tools
Class to which Method Moved : service/AuthService
Dependency Classes Affected : component/AuthSuccesshandler, rest/Oauth2Controller
Methods involved: getAuthParams()

Design Smell Refactoring 3:
Name : Pull Up Method & Extract Method
Code Smell: Insufficient Modularization
Location :
Path: src/main/java
Package: alovoa/service
Class: Tools
New Class: AgeUtils
Method: convertPrefAgeToRelativeYear(), convertPrefAgeToExactYear()