Fix SLF4J conflict with Kotlin scripting, default log level

[gabrielfeo]

In #178, logging was changed to SLF4J and logback-classic. To keep it possible to set the log level via environment variables (Config.logLevel / DEVELOCITY_API_LOG_LEVEL), a small hack was in place. Kotlin scripts, which have slf4j-simple in the classpath by default, crashed due to this hack.

java.lang.ClassCastException: class org.slf4j.impl.SimpleLogger cannot be cast to class ch.qos.logback.classic.Logger (org.slf4j.impl.SimpleLogger is in unnamed module of loader java.net.URLClassLoader @3a0f0552; ch.qos.logback.classic.Logger is in unnamed module of loader java.net.URLClassLoader @47b530e0)
        at com.gabrielfeo.develocity.api.internal.RealLoggerFactory.newLogger(LoggerFactory.kt:17)
        at com.gabrielfeo.develocity.api.internal.OkHttpClientKt.addNetworkInterceptors(OkHttpClient.kt:61)
        at com.gabrielfeo.develocity.api.internal.OkHttpClientKt.buildOkHttpClient(OkHttpClient.kt:35)
        at com.gabrielfeo.develocity.api.RealDevelocityApi$okHttpClient$2.invoke(DevelocityApi.kt:72)
        at com.gabrielfeo.develocity.api.RealDevelocityApi$okHttpClient$2.invoke(DevelocityApi.kt:71)
        at kotlin.SynchronizedLazyImpl.getValue(LazyJVM.kt:74)
        at com.gabrielfeo.develocity.api.RealDevelocityApi.getOkHttpClient(DevelocityApi.kt:71)
        at com.gabrielfeo.develocity.api.RealDevelocityApi.access$getOkHttpClient(DevelocityApi.kt:67)
        at com.gabrielfeo.develocity.api.RealDevelocityApi$retrofit$2.invoke(DevelocityApi.kt:78)
        at com.gabrielfeo.develocity.api.RealDevelocityApi$retrofit$2.invoke(DevelocityApi.kt:75)
        at kotlin.SynchronizedLazyImpl.getValue(LazyJVM.kt:74)
        at com.gabrielfeo.develocity.api.RealDevelocityApi.getRetrofit(DevelocityApi.kt:75)
        at com.gabrielfeo.develocity.api.RealDevelocityApi.access$getRetrofit(DevelocityApi.kt:67)
        at com.gabrielfeo.develocity.api.RealDevelocityApi$buildsApi$2.invoke(DevelocityApi.kt:84)
        at com.gabrielfeo.develocity.api.RealDevelocityApi$buildsApi$2.invoke(DevelocityApi.kt:84)
        at kotlin.SynchronizedLazyImpl.getValue(LazyJVM.kt:74)
        at com.gabrielfeo.develocity.api.RealDevelocityApi.getBuildsApi(DevelocityApi.kt:84)
        at Example_script_main$builds$1.invokeSuspend(example-script.main.kts:39)
        at kotlin.coroutines.jvm.internal.BaseContinuationImpl.resumeWith(ContinuationImpl.kt:33)
        at kotlinx.coroutines.DispatchedTask.run(DispatchedTask.kt:104)
        at kotlinx.coroutines.EventLoopImplBase.processNextEvent(EventLoop.common.kt:277)
        at kotlinx.coroutines.BlockingCoroutine.joinBlocking(Builders.kt:95)
        at kotlinx.coroutines.BuildersKt__BuildersKt.runBlocking(Builders.kt:69)
        at kotlinx.coroutines.BuildersKt.runBlocking(Unknown Source)
        at kotlinx.coroutines.BuildersKt__BuildersKt.runBlocking$default(Builders.kt:48)
        at kotlinx.coroutines.BuildersKt.runBlocking$default(Unknown Source)
        at Example_script_main.<init>(example-script.main.kts:38)

Also, the default log level was 'info', but it was supposed to be 'off'.

• Remove logback and any reference to SLF4J impls
• Add slf4j-simple instead with a simpler hack ✨ to set the log level from environment variables
• Fix the default log level to be 'off', unless it'd conflict with the user's own SimpleLogger default
• Document what the llbrary logs on each log level

[github-actions]

Generated API diff