docs: finalize Arrow SQL Server release identity

[mag1cfrog]

Summary

• finalize the Arrow SQL Server name across public documentation and package metadata
• prepare the crate as version 0.3.0 with the new crates.io, docs.rs, and future GitHub repository targets
• document the direct rename from arrow-tiberius and arrow_tiberius without a compatibility package or re-export

Impact

Consumers of the next release will depend on arrow-sql-server = "0.3" and import arrow_sql_server. Existing arrow-tiberius releases remain historical crates.io versions.

This PR prepares release artifacts only. It does not publish the crate, rename the GitHub repository, rename the local folder, create a tag or release, or yank prior versions.

Validation

• cargo fmt --check
• cargo clippy --workspace --all-targets --all-features -- -D warnings
• cargo test --workspace
• cargo doc --workspace --all-features --no-deps
• cargo check --examples --all-features
• nested Arrow ODBC and ODBC BCP runner formatting, compilation, tests, and clippy
• cargo xtask sqlserver-test
• cargo package --list
• cargo publish --dry-run --locked
• tracked old-name audit, with only intentional changelog migration references remaining

Closes #188