Use RwLock instead of RefCell for local connection

The `local::Connection` struct has the following safety comments:

```rust
// SAFETY: This is safe because we compile sqlite3 w/ SQLITE_THREADSAFE=1
unsafe impl Send for Connection {}
// SAFETY: This is safe because we compile sqlite3 w/ SQLITE_THREADSAFE=1
unsafe impl Sync for Connection {}
```

This is correct with respect to the `*mut ffi::sqlite3` field, but NOT
with respect to the `RefCell<Option<AuthHook>>` field. Heavy load in
a real application using local databases occasionally sees panics due
to concurrent access to this RefCell.