aldis-ameriks / pg-notify / #773

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feat: add onConnectionError callback option

Add optional callback for handling terminal reconnection failures
that occur asynchronously after a connection drop. The callback is
only invoked for async errors — initial connect() failures are
handled via the rejected promise directly.

Also fixes Error cause being passed incorrectly (now uses { cause: err })
and ensures _reconnect() promise rejections are properly caught.

58 of 61 branches covered (95.08%)

Branch coverage included in aggregate %.

17 of 18 new or added lines in 1 file covered. (94.44%)

198 of 199 relevant lines covered (99.5%)

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