Add 'copyBuffer' option

This release introduces a new option called 'copyBuffer', the option is not set by default.
If the option is set the client will create a new buffer for each flush() call with the data belongs to the returned promise.
This prevents creating duplicate rows if await is missed when calling flush() or if the calls to flush() are not serialised.

Example:

const sender = new Sender({ copyBuffer: true });

First release

Node.js client for QuestDB.

Connect to QuestDB and ingest data via ILP.
Supports TLS encryption and ILP authentication.