Support connecting to Postgres via DistSQL in Proxy Native

[linghengqian]

For #29052.

Changes proposed in this pull request:

• Support connecting to Postgres via DistSQL in Proxy Native.
• Refactores commons package to simplify unit test hierarchy.
• Declares blocking issues of Apache Doris FE and Presto Server in the documentation.
• Provides the steps required to compile to a fully static GraalVM Native Image.

---

Before committing this PR, I'm sure that I have checked the following options:

• My code follows the code of conduct of this project.
• I have self-reviewed the commit code.
• I have (or in comment I request) added corresponding labels for the pull request.
• I have passed maven check locally : ./mvnw clean install -B -T1C -Dmaven.javadoc.skip -Dmaven.jacoco.skip -e.
• I have made corresponding changes to the documentation.
• I have added corresponding unit tests for my changes.

[strongduanmu]

Good job, merged.