ISSUE-145 Remove logback from main dependencies

[chibenwa]

Keep it as a testing dependency

Description

java.lang.NoSuchMethodError: 'java.lang.String ch.qos.logback.core.util.EnvUtil.logbackVersion()'

    at ch.qos.logback.classic.util.ContextInitializer.autoConfig(ContextInitializer.java:81)
    at ch.qos.logback.classic.util.ContextInitializer.autoConfig(ContextInitializer.java:77)
    at ch.qos.logback.classic.spi.LogbackServiceProvider.initializeLoggerContext(LogbackServiceProvider.java:50)
    at ch.qos.logback.classic.spi.LogbackServiceProvider.initialize(LogbackServiceProvider.java:41)
    at org.slf4j.LoggerFactory.bind(LoggerFactory.java:183)
    at org.slf4j.LoggerFactory.performInitialization(LoggerFactory.java:170)
    at org.slf4j.LoggerFactory.getProvider(LoggerFactory.java:455)
    at org.slf4j.LoggerFactory.getILoggerFactory(LoggerFactory.java:441)
    at org.slf4j.LoggerFactory.getLogger(LoggerFactory.java:390)
    at org.slf4j.LoggerFactory.getLogger(LoggerFactory.java:416)
    at org.apache.james.mock.smtp.server.testing.MockSmtpServerExtension$DockerMockSmtp.<clinit>(MockSmtpServerExtension.java:43)
    at org.apache.james.mock.smtp.server.testing.MockSmtpServerExtension.<init>(MockSmtpServerExtension.java:77)
    at org.apache.james.mailets.RemoteDeliveryForwardIntegrationTest.<clinit>(RemoteDeliveryForwardIntegrationTest.java:76)

Motivation and Context

SLF4J should be enough (logging facade)

How Has This Been Tested?

Existing tests passes

Screenshots (if appropriate):

Types of changes

• [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 change)
• [ ] Major release (change is NOT backward compatible with prior release)

Checklist:

• [x] My code follows the code style of this project.
• [x] My change requires a change to the documentation.
• [x] I have updated the documentation accordingly.
• [x] I have read the CONTRIBUTING document.
• [x] I have added tests to cover my changes.
• [x] All new and existing tests passed.

[chibenwa]

Hello @fansu

What's the ETA of this?