Make console runner use the same java installation as the calling process (#227)

## Usage and product changes
Makes TypeDB console runner use the same java installation as the
calling process, so the system remain hermetic.

## Implementation
* Sets `JAVA_HOME` for the console subprocess to the `java.home` system
property of the host process.

Author: krishnangovindraj

tool/runner/TypeDBConsoleRunner.java

@@ -43,6 +43,7 @@ public TypeDBConsoleRunner() throws InterruptedException, TimeoutException, IOEx
         System.out.println(name() + " distribution archive extracted.");
         executor = new ProcessExecutor()
                 .directory(distribution.toFile())
+                .environment("JAVA_HOME", System.getProperty("java.home"))
                 .redirectOutput(System.out)
                 .redirectError(System.err)
                 .readOutput(true)