DRILL-5963: Query state process improvements
1. Added two new query states: PREPARING (when foreman is initialized) and PLANNING (includes logical and / or physical planning).
2. Ability to cancel query during planning and enqueued states was added.
3. Logic for submitting fragments was moved from Foreman to new class FragmentsRunner.
4. Logic for moving query from to new state and incrementing / decrementing query counters was moved into QueryStateProcessor class.
5. Major type in DrillFuncHolderExpr was cached for better performance.
closes #1051
