Prepare for 0.60.0: Changelog and update version

[alamb]

• part of Release sqlparser-rs version 0.60.0 around 2025-11-15 #2045

Prepare for 0.60.0 release:

1. Increase version to 0.60.0
2. Add changelog. Preview: https://github.com/alamb/sqlparser-rs/blob/alamb/prepare_0.60.0/changelog/0.60.0.md

[Copilot]

Pull request overview

This PR prepares for the 0.60.0 release by bumping the version number in Cargo.toml and adding a comprehensive changelog documenting 37 commits from 20 contributors. The release includes enhancements, bug fixes, and various other improvements across multiple SQL dialects including Snowflake, MySQL, PostgreSQL, SQLite, ClickHouse, Databricks, and Oracle.

• Version updated from 0.59.0 to 0.60.0 in main Cargo.toml
• New changelog file created documenting all changes for this release

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 2 comments.

File	Description
Cargo.toml	Updated package version from 0.59.0 to 0.60.0
changelog/0.60.0.md	Added comprehensive changelog with 37 commits, categorized into enhancements, bug fixes, and other improvements, including proper Apache license header and contributor credits

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