chore(main): release 0.9.0 (#60)

Co-authored-by: github-actions[bot] <41898282+github-actions[bot]@users.noreply.github.com>

v0.7.0: contracts pack, schema-snapshot, validate-contract

v0.6.2 - W013 window-without-partition (Prabhu-1409, #21)

sql-sop 0.6.1

W019 count-distinct-unbounded — warns on COUNT(DISTINCT col) without
WHERE / GROUP BY / LIMIT / TOP / FETCH NEXT scope. Forces a full sort
+ distinct pass on big tables. Contributed by @mvanhorn (PR #29).

sql-guard 0.6.0

New rules
- E007 alter-add-not-null-no-default
- E008 drop-column
- W017 leading-wildcard-like
- W018 or-across-columns
- W020 truncate-table
- T005 create-index-without-online

Platform
- inline -- sql-guard: disable directives
- .sql-guard.yml project config
- --changed-only filter via git diff
- SARIF 2.1.0 output for GitHub Code Scanning

v0.5.0 - T-SQL rules

v0.4.1 - GitHub Marketplace launch + engagement pack

v0.4.0: libCST-based Python file scanning