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ARROW-9653: [Rust][DataFusion] Do not error in planner with SQL has multiple group by expressions

Fix a loop bound bug in aggregate expression handling, tests for same

h2. Before this PR
```
CREATE EXTERNAL TABLE repro(a INT, b INT)
STORED AS CSV
WITH HEADER ROW
LOCATION 'repro.csv';

select sum(a), a, b from repro group by a, b;
ArrowError(InvalidArgumentError("number of columns(4) must match number of fields(3) in schema"))
```

h2. After this PR:

```
CREATE EXTERNAL TABLE repro(a INT, b INT)
STORED AS CSV
WITH HEADER ROW
LOCATION 'repro.csv';

> select sum(a), a, b from repro group by a, b;

+--------+---+-----+
| sum(a) | a | b   |
+--------+---+-----+
| 2      | 2 | 100 |
| 1      | 1 | 100 |
| 2      | 2 | 200 |
| 1      | 1 | 200 |
| 2      | 2 | 300 |
+--------+---+-----+
5 row in set. Query took 0 seconds.
```

contents of `repro.csv`
```
a,b
1,100
1,200
2,100
2,200
2,300
```

Closes #7924 from alamb/alamb/ARROW-9653-multicol-group-by

Authored-by: alamb <andrew@nerdnetworks.org>
Signed-off-by: Andy Grove <andygrove73@gmail.com>