refactor(root): move logging settings/configuration into a single package

[notjuanortiz]

This PR includes a few minor, but related, changes.

• Moves LoggingSettings, and LoggingConfigurationFactory into a single package io.luna.logging
• Separates file reading logic from logging settings/configuration (see Luna.class), This was done in case someone wants to change the file type being read (currently .toml).
• Includes unit test for TomlLoggingSettingFileReader to ensure the code works as intended.

Contributes to #215 .

[TravisBuddy]

Hey @notjuanortiz,
Your changes look good to me!

View build log

TravisBuddy Request Identifier: 879c0450-6d33-11ea-8920-b3945d724fa9

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[lare96]

Looks good, but I think the old TOML loading was more clear and concise. Could it be changed back?

[notjuanortiz]

826565c

By creating an abstraction I've decoupled reading the logging settings from a file from actually starting the server.
I also made support for reading settings from other file types much easier to implement. I'm not sure I understand what the motivation to revert this change is.