[DRAFT] Type-check metrics query_builder and remove module ignore

[cursor]

Summary

• remove sentry.snuba.metrics.query_builder from the mypy module-ignores override list in pyproject.toml
• fix all mypy errors in src/sentry/snuba/metrics/query_builder.py
• tighten type narrowing for group-by/order-by handling and keep runtime metric params intact while satisfying typing

Testing

• source .venv/bin/activate && python -m tools.mypy_helpers.mypy_without_ignores src/sentry/snuba/metrics/query_builder.py
• source .venv/bin/activate && .venv/bin/pytest -n3 -svv --reuse-db tests/sentry/snuba/metrics/test_query_builder.py
• source .venv/bin/activate && .venv/bin/prek run -q
• make test-selective (fails in this environment because gcloud is unavailable)

cc @armenzg

Legal Boilerplate

Look, I get it. The entity doing business as "Sentry" was incorporated in the State of Delaware in 2015 as Functional Software, Inc. and is gonna need some rights from me in order to utilize my contributions in this here PR. So here's the deal: I retain all rights, title and interest in and to my contributions, and by keeping this boilerplate intact I confirm that Sentry can use, modify, copy, and redistribute my contributions, under Sentry's choice of terms.