[KYUUBI #871] Change module name kyuubi-main to kyuubi-server

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### _Why are the changes needed?_
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As we will release soon, it's better to format the module name and artifactId.

The name of kyuubi-main sounds like a bootstrap of Kyuubi but not a server.

### _How was this patch tested?_
Pass CI

Closes #872 from ulysses-you/kyuubi-server.

Closes #871

1437f9b5 [ulysses-you] address comment
117f2c7c [ulysses-you] server
86986baa [ulysses-you] master
eba660a2 [ulysses-you] Merge branch 'master' of https://github.com/NetEase/kyuubi into kyuubi-server
e649012b [ulysses-you] change module name

Authored-by: ulysses-you <ulyssesyou18@gmail.com>
Signed-off-by: Cheng Pan <chengpan@apache.org>

dev/kyuubi-codecov/pom.xml

@@ -64,7 +64,7 @@
 
         <dependency>
             <groupId>org.apache.kyuubi</groupId>
-            <artifactId>kyuubi-main</artifactId>
+            <artifactId>kyuubi-server</artifactId>
             <version>${project.version}</version>
         </dependency>
 

kyuubi-assembly/pom.xml

@@ -53,7 +53,7 @@
 
         <dependency>
             <groupId>org.apache.kyuubi</groupId>
-            <artifactId>kyuubi-main</artifactId>
+            <artifactId>kyuubi-server</artifactId>
             <version>${project.version}</version>
         </dependency>
 

kyuubi-server/pom.xml

@@ -26,8 +26,8 @@
     </parent>
     <modelVersion>4.0.0</modelVersion>
 
-    <artifactId>kyuubi-main</artifactId>
-    <name>Kyuubi Project Server Main</name>
+    <artifactId>kyuubi-server</artifactId>
+    <name>Kyuubi Project Server</name>
     <packaging>jar</packaging>
 
     <dependencies>

kyuubi-server/src/main/scala/org/apache/kyuubi/engine/spark/SparkProcessBuilder.scala

@@ -39,7 +39,8 @@ class SparkProcessBuilder(
 
   override protected val executable: String = {
     val sparkHomeOpt = env.get("SPARK_HOME").orElse {
-      val cwd = getClass.getProtectionDomain.getCodeSource.getLocation.getPath.split("kyuubi-main")
+      val cwd = getClass.getProtectionDomain.getCodeSource.getLocation.getPath
+        .split("kyuubi-server")
       assert(cwd.length > 1)
       Paths.get(cwd.head)
         .resolve("externals")