Review names of configuration settings

### What is the problem the feature request solves?

The configuration settings have many inconsistencies.

For example, we have many different prefixes for shuffle-related configs:

- `spark.comet.columnar.shuffle`
- `spark.comet.exec.shuffle`
- `spark.comet.native.shuffle`
- `spark.comet.shuffle`

There are also differences in convention for naming within configs:

- `mergeRanges` (Camel Case)
- `thread-pool` (Hyphenated)
- `read.parallel.io` (dot separated)

Renaming any of these configs will be disruptive to users. If we do rename them, I suggest we do it for the 1.0.0 release.

We could also consider introducing a capability to support the old deprecated names for some period of time.

### Describe the potential solution

_No response_

### Additional context

_No response_