Release sqlparser-rs version 0.51.0 #1384

Follow on to #1349

Filing a ticket here to track the work of a release (mostly so others can follow along)

Target Release Date: Approximately 2024-09-15

Release instructions: https://github.com/sqlparser-rs/sqlparser-rs/blob/main/docs/releasing.md

Steps:

• Make a PR to update CHANGELOG.md:
• run cargo release
• verify the new release is on crates.io: https://crates.io/crates/sqlparser/0.51.0
• Make ticket for next release: Release sqlparser-rs version 0.52.0 #1423