Remove mbqlEq() and mbql() functions obsoleted by MBQL normalization

frontend/src/metabase-lib/lib/Dimension.js

frontend/src/metabase/lib/expressions/index.js

frontend/src/metabase/lib/query.js

frontend/src/metabase/lib/query/aggregation.js

frontend/src/metabase/lib/query/field.js

frontend/src/metabase/lib/query/filter.js

frontend/src/metabase/lib/query/util.js

frontend/src/metabase/lib/query_time.js

frontend/src/metabase/meta/Dashboard.js

frontend/src/metabase/meta/Parameter.js

...e/query_builder/components/filters/pickers/DatePicker.jsx

...e/query_builder/components/filters/pickers/TimePicker.jsx