[DISCUSS] [DSIP-105] Sensitive Variable Support — Seeking feedback and reviewers

[陆小龙 <18...@126.com>]

Hi community,

I previously created DSIP-105 [1] to introduce sensitive variable support (masking in API/UI + encrypted storage) for DolphinScheduler. The design has been detailed in the issue, and I have also submitted an initial PR [2] for implementation.

However, the proposal hasn't received much feedback yet, and the PR is pending review. This is a feature we (CT Cloud / 天翼云) heavily need in production — we currently have secrets exposed in plaintext across workflow parameters.

I'd appreciate it if community members could take a look and share your thoughts, especially on:
- The `sensitive` boolean flag approach in the Property class
- The `******` placeholder merge behavior on save
- Reusing PasswordUtils for encryption (shared with datasource encryption config)

If anyone is interested in co-reviewing or has concerns about the design, I'm happy to adjust. Looking forward to your feedback!

[1] https://github.com/apache/dolphinscheduler/issues/17937
[2] https://github.com/apache/dolphinscheduler/pull/18329

Thanks,
luxiaolong / det101