tracking: Custom SSL certificate with secret

[st1page]

After https://github.com/risingwavelabs/risingwave/pull/17456, RisingWave has gained a certain level of capability in managing certificates for administration. User can write options like xxx.location = SECRET yyy AS FILE. But there is still work to be done to support SSL configurations with secrets in different places.

We at least need to prioritize support for the following distinct requirements, and then additional connectors can be supplemented as needed afterward. We should provide support for the following and add corresponding tests and docs.

• Source
  • [ ] Kafka
  • [ ] MySQL
  • [x] https://github.com/risingwavelabs/risingwave/issues/17785
• Sink
  • [ ] Kafka
  • [ ] MySQL
  • [ ] PostgreSQL
• schema registry
  • [ ] https://github.com/risingwavelabs/risingwave/issues/17173

[BugenZhao]

Also link to #17202

[fuyufjh]

cc. @tabVersion Can you please help to support SECRET in those connectors that already has SSL support? such as Kafka.