`ApplyHistoryBest` right now plays a role as the database adaptor to query inside the database.
In fact, the logic could be simplified and users only have to deal with `Database` instead of this
extra object.
- [x] Add `EnterWithScope`/`ExitWithScope`/`Current` to Database
- [x] Migrate `te_filter_func` => "tir_filter" in Relay's pass context
- [x] Migrate `f_take_tuning_record` => "Database.query_tuning_record"
- [x] Migrate `TECompiler` to use `Database`
- [x] Remove apply-history-best
Next PR:
- Migrate `f_direct_dispatch` (potentially unify with `apply_fixed_schedule`?)
Junru Shao
370abe69d2