Add a query option to skip all indexes to help debug potential index issues

Propose to add a query option to skip all indexes when to run a query. If turning this option on, the query just scans over the fwd index to evaluate the filters, w/o using any indexes. This can help narrow down the scope when debug queries that might be affected by issues in indexes. Similar with the query option `useStarTree`.

Either we just add a big hammer query option that simply skip all kinds of indexes like `skipIndexes=true`; or add a query option like `skipIndexes=.[,.]` to have finer grained control.

Start with the existing `useStarTree` query option and the query/index execution paths. Decide whether the option should skip all indexes or support per-index selection, then verify that filtered queries scan the forward index without using indexes and add coverage for the chosen semantics.

Written by the indexing model from the issue text.