Add some tests on inlined query

com.oracle.truffle.r.test/tests/pgsql/QueryInline.R

+q = select(function (x) {
+             res = new.env()
+             res$ename = x$ename
+             res },
+    from(new.tableRef("emp", "PostgreSQL", "postgre.config", "public")))
+results = query.force(q)
+print(results)

com.oracle.truffle.r.test/tests/pgsql/QueryInline.out

+    ename
+1   SMITH
+2   ALLEN
+3    WARD
+4   JONES
+5  MARTIN
+6   BLAKE
+7   CLARK
+8   SCOTT
+9    KING
+10 TURNER
+11  ADAMS
+12  JAMES
+13   FORD
+14 MILLER
+

com.oracle.truffle.r.test/tests/pgsql/QueryInlineWithFreeVars.R

+tableName = "emp"
+dbName = "PostgreSQL"
+configFile = "postgre.config"
+schemaName = "public"
+q = select(function (x) {
+             res = new.env()
+             res$ename = x$ename
+             res },
+    from(new.tableRef("emp", "PostgreSQL", "postgre.config", "public")))
+results = query.force(q)
+print(results)

com.oracle.truffle.r.test/tests/pgsql/QueryInlineWithFreeVars.out

+    ename
+1   SMITH
+2   ALLEN
+3    WARD
+4   JONES
+5  MARTIN
+6   BLAKE
+7   CLARK
+8   SCOTT
+9    KING
+10 TURNER
+11  ADAMS
+12  JAMES
+13   FORD
+14 MILLER
+