[Feature] The paimon parameter key has a uniform prefix

### Search before asking

- [X] I searched in the [issues](https://github.com/apache/incubator-paimon/issues) and found nothing similar.

### Motivation

The paimon parameter key has a uniform prefix. Parameters such as hudi and spark have uniform prefixes for easy identification

### Solution

_No response_

### Anything else?

_No response_

### Are you willing to submit a PR?

- [x] I'm willing to submit a PR!

The issue does not name any files, parameter definitions, or a prefix convention. Start by locating Paimon’s parameter declarations and compare how Hudi and Spark identify their parameters; confirm the intended naming scheme before changing anything. Done means the convention is agreed, applied consistently, and covered by the relevant tests.

Written by the indexing model from the issue text.