Add transaction timeout option setter (#182)

## What is the goal of this PR?

Add transaction timeouts to the console options available. This allows users to manipulate the transaction timeout added in typedb/typedb-driver#364.

## What are the changes implemented in this PR?

* add extra option for transaction timeout
* bump version to 2.6.1 to prepare for patch release

Author: flyingsilverfin

VERSION

@@ -1 +1 @@
-2.6.0
+2.6.1

command/REPLCommand.java

@@ -494,6 +494,7 @@ static class Core {
                     Option.core("batch-size", Option.Arg.INTEGER, "Set RPC answer batch size", (opt, arg) -> opt.prefetchSize((Integer) arg)),
                     Option.core("prefetch", Option.Arg.BOOLEAN, "Enable or disable RPC answer prefetch ", (opt, arg) -> opt.prefetch((Boolean) arg)),
                     Option.core("session-idle-timeout", Option.Arg.INTEGER, "Kill idle session timeout (ms)", (opt, arg) -> opt.sessionIdleTimeoutMillis((Integer) arg)),
+                    Option.core("transaction-timeout", Option.Arg.INTEGER, "Kill transaction timeout (ms)", (opt, arg) -> opt.transactionTimeoutMillis((Integer) arg)),
                     Option.core("schema-lock-acquire-timeout", Option.Arg.INTEGER, "Acquire exclusive schema session timeout (ms)", (opt, arg) -> opt.schemaLockAcquireTimeoutMillis((Integer) arg))
             );