feat: add fix option to lint command

[benfdking]

Summary

• add --fix flag to sqlmesh lint to apply automatic fixes and fail on remaining errors
• implement fix application for lint violations
• document new lint fix option and add tests

Testing

• pre-commit run --files docs/examples/sqlmesh_cli_crash_course.md docs/guides/linter.md docs/reference/cli.md sqlmesh/cli/main.py sqlmesh/core/context.py tests/cli/test_cli.py
• pytest tests/cli/test_cli.py::test_lint_fix tests/cli/test_cli.py::test_lint_fix_unfixable_error -q

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https://chatgpt.com/codex/tasks/task_e_6899c89c18fc8330a9329492edcfeaff