MSSQL: Support multiple columns after ALTER TABLE ADD - #2449
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SQL Server allows multiple column definitions after one
ALTER TABLE ... ADDclause.This adds a dialect capability for implicit ADD items, preserves repeated ADD syntax, and covers columns with nested type/default expressions plus inline CHECK constraints. Other dialects retain the existing operation parsing.
Validation: cargo test --all-features, cargo fmt --all -- --check, and cargo clippy --all-targets --all-features -- -D warnings.