Release version 0.46.0 #1214

Follow on to #1162

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

Target Release Date: Approximately 2024-05-12

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

Steps:

• Make a PR to update CHANGELOG.md: CHANGELOG for 0.46.0 #1250
• run cargo release
• verify the new release is on crates.io: https://crates.io/crates/sqlparser
• Make ticket for next release: Release version 0.47.0 #1251