feat: rename back rudderlogger to logger using typealias

[ChryssaAliferi]

Ticket

Description

In this ticket, we want to revert the correct naming of the RudderLogger to Logger. The reason is that moving forward, and as agreed with the product at the beginning of the project, we need to have naming conventions as per market standards, and not use the Rudder prefix.

Type of change

• [x] Bug fix (non-breaking change which fixes an issue)
• [ ] New feature (non-breaking change which adds functionality)
• [ ] Breaking change (fix or feature that would cause existing functionality to not work as expected)
• [ ] This change requires a documentation update

Implementation Details

• Removed some useless tests -out of the scope of this PR, but was easy to do-.
• Renamed RudderLogger to Logger
• Created an alias to RudderLogLevel for a better migration with the older project

Checklist:

• [ ] Version upgraded (project, README, gradle, podspec etc)
• [x] My code follows the style guidelines of this project
• [x] I have performed a self-review of my own code
• [ ] I have commented my code, particularly in hard-to-understand areas
• [ ] I have added unit tests for the code
• [ ] I have made corresponding changes to the documentation

[sonarcloud[bot]]

Quality Gate passed

Issues
5 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarCloud