Remove SWH-specific compression code

This keeps webgraph and Sux4J compression classes, as we still use a handful of those, to create files whose generation won't be rewritten in Rust

Assuming a warm cache of dependency JARs, this makes 'make java' go from 18s to 11s and the produced uber JAR from 121MB to 61MB.

java/src/assembly/assembly.xml

-    <assembly xmlns="http://maven.apache.org/ASSEMBLY/2.1.1"
-      xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
-      xsi:schemaLocation="http://maven.apache.org/ASSEMBLY/2.1.1 https://maven.apache.org/xsd/assembly-2.1.1.xsd">
-      <!-- TODO: a jarjar format would be better -->
-      <id>swh-graph-with-dependencies</id>
-      <formats>
-        <format>jar</format>
-      </formats>
-      <includeBaseDirectory>false</includeBaseDirectory>
-      <dependencySets>
-        <dependencySet>
-          <outputDirectory>/</outputDirectory>
-          <useProjectArtifact>true</useProjectArtifact>
-          <useStrictFiltering>true</useStrictFiltering>
-          <useTransitiveFiltering>true</useTransitiveFiltering>
-          <unpack>true</unpack>
-          <scope>runtime</scope>
-          <excludes>
-            <exclude>org.apache.hadoop:hadoop-auth</exclude>
-            <exclude>org.apache.hadoop.thirdparty:hadoop-shaded-guava</exclude>
-            <exclude>org.apache.zookeeper:zookeeper</exclude>
-            <exclude>org.apache.curator:*</exclude>
-            <exclude>org.eclipse.jetty:jetty*</exclude>
-            <exclude>org.apache.zookeeper:zookeeper</exclude>
-          </excludes>
-        </dependencySet>
-      </dependencySets>
-    </assembly>