* Fix pg-query-stream
There were some subtle behaviors with the stream being implemented incorrectly & not working as expected with async iteration. I've modified the code based on #2050 and comments in #2035 to have better test coverage of async iterables and update the internals significantly to more closely match the readable stream interface.
Note: this is a __breaking__ (semver major) change to this package as the close event behavior is changed slightly, and `highWaterMark` is no longer supported. It shouldn't impact most usage, but breaking regardless.
* Remove a bunch of additional code
* Add test for destroy + error propagation
* Add failing test for destroying unsubmitted stream
* Do not throw an uncatchable error when closing an unused cursor
Working on fixing some timing issues in pg-query-stream it uncovered an issue where the cursor is firing its 'close' callback before it's actually entirely ready to dispatch another query. This change makes the close callback trigger when the connection re-enters `readyForQuery` state.
