Simplify configuration naming

### Description

Current configuration naming is too long, I propose use more shorter naming which mean remove `.sql.columnar.backend.` part, newly naming will looks like below.
```
spark.gluten..a.b.c
// spark.gluten.velox.a.b
// spark.gluten.clickhouse.a.b

spark.gluten..a.b.c
// spark.gluten.memory.a.b.c
// spark.gluten.shuffle.a.b.c
```

@zhouyuan @rui-mo @zhztheplayer

Start by locating the configuration key definitions and their references in the repository, then inventory the backend-specific and common names described in the issue. Done means the proposed shorter names are consistently defined and used, with the affected configuration tests or validation checks passing.

Written by the indexing model from the issue text.