feat(db): Add databased providers assumptions

providers/mongodb/src/main/java/cc/carm/lib/configuration/source/mongodb/MongoSource.java

@@ -0,0 +1,4 @@
+package cc.carm.lib.configuration.source.mongodb;
+
+public class MongoSource {
+}

providers/mongodb/src/test/resources/log4j2.xml

@@ -0,0 +1,19 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<Configuration status="WARN" packages="config.SQLConfigTest">
+    <Appenders>
+        <console name="Console" target="SYSTEM_OUT">
+            <PatternLayout pattern="[%d{HH:mm:ss} %level]: %msg%n"/>
+        </console>
+    </Appenders>
+    <Loggers>
+        <Root level="info">
+            <filters>
+                <MarkerFilter marker="NETWORK_PACKETS" onMatch="DENY" onMismatch="NEUTRAL"/>
+                <RegexFilter regex=".*\$\{[^}]*\}.*" onMatch="DENY" onMismatch="NEUTRAL"/>
+            </filters>
+            <AppenderRef ref="File"/>
+            <appender-ref ref="Console"/>
+        </Root>
+    </Loggers>
+</Configuration>
+