[skip-ci] docs: update README to reflect PostgreSQL support

[rahim-kanji]

Add PostgreSQL to the list of supported databases alongside MySQL (and forks).

[gemini-code-assist]

Summary of Changes

Hello @rahim-kanji, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request primarily focuses on enhancing the README.md to accurately reflect ProxySQL's expanded capabilities, specifically its support for PostgreSQL. It updates critical documentation, including installation instructions, version numbers, and detailed guidance on configuring and managing ProxySQL for PostgreSQL databases, ensuring users have up-to-date and comprehensive information.

Highlights

• PostgreSQL Support Announcement: The README now explicitly states that ProxySQL supports PostgreSQL, offering high-performance, HA, and manageability features for Postgres workloads, alongside MySQL.
• Updated Version and Download Links: Installation and upgrade instructions have been updated to reflect the latest version, v3.0.4, including new download URLs for .deb packages.
• PostgreSQL Admin Interface Examples: New sections have been added detailing how to connect to and manage ProxySQL's admin interface for PostgreSQL using the psql client on port 6132, complementing the existing MySQL examples.
• PostgreSQL Configuration Documentation: The configuration section now includes detailed examples and descriptions for pgsql_variables, pgsql_servers, pgsql_users, and pgsql_query_rules, outlining how to configure ProxySQL for PostgreSQL traffic.

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[gemini-code-assist]

Code Review

This pull request updates the README.md to reflect the newly added PostgreSQL support in ProxySQL. The changes are comprehensive, including updates to the introduction, version numbers in installation examples, and adding new sections for PostgreSQL-specific admin commands and configuration options. The documentation is now clearer and more complete.

I have one minor suggestion to fix a markdown formatting issue in a note, which will ensure it renders correctly.

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud

[renecannao]

Thank you @rahim-kanji !