Cleanup legacy files. (#1914)

This PR involves cleaning up proto files, and common file/classes. More specifically, it

- Removes `interactive_engine/rust-common`
- Removes a bunch of legacy proto files
- Removes lots of classes in `interactive_engine/common/`
- Cleanup `interactive_engine/deploy` directory.
- Reduce some maven dependencies.

interactive_engine/common/pom.xml

@@ -33,37 +33,7 @@
       <groupId>com.fasterxml.jackson.module</groupId>
       <artifactId>jackson-module-paranamer</artifactId>
     </dependency>
-    <dependency>
-      <groupId>org.testng</groupId>
-      <artifactId>testng</artifactId>
-    </dependency>
 
-    <dependency>
-      <groupId>org.apache.hadoop</groupId>
-      <artifactId>hadoop-common</artifactId>
-      <exclusions>
-        <exclusion>
-          <groupId>org.apache.httpcomponents</groupId>
-          <artifactId>httpclient</artifactId>
-        </exclusion>
-        <exclusion>
-          <groupId>org.apache.zookeeper</groupId>
-          <artifactId>zookeeper</artifactId>
-        </exclusion>
-        <exclusion>
-          <groupId>log4j</groupId>
-          <artifactId>log4j</artifactId>
-        </exclusion>
-        <exclusion>
-          <groupId>org.slf4j</groupId>
-          <artifactId>slf4j-log4j12</artifactId>
-        </exclusion>
-        <exclusion>
-          <groupId>javax.servlet</groupId>
-          <artifactId>servlet-api</artifactId>
-        </exclusion>
-      </exclusions>
-    </dependency>
     <dependency>
       <groupId>org.apache.curator</groupId>
       <artifactId>curator-framework</artifactId>