Allow BigInt/Buffer to be used as initialSequenceId and/or sequenceId

Hello there,

Right now the producer's sequence ID is limited to 4 bytes here:

- https://github.com/apache/pulsar-client-node/blob/master/src/ProducerConfig.cc#L76
- https://github.com/apache/pulsar-client-node/blob/master/src/Message.cc#L174

However we could allow 8 bytes integers if we allow producer/message to receive a [BigInt](https://nodejs.org/api/n-api.html#n_api_napi_get_value_bigint_int64) and/or a [8 bytes buffer](https://nodejs.org/api/buffer.html#buffer_buf_writebigint64le_value_offset).

I'm trying to match a dataset that uses 8 bytes integers for keys as my sequence ID, that's why I found this limitation :-)

首先检查 src/ProducerConfig.cc#L76 和 src/Message.cc#L174 中的序列 ID 处理，以及使用这些值的 producer 和 message 接口。确定应如何接受 BigInt 和 8 字节 Buffer 输入，然后验证 8 字节序列 ID 可以在不发生截断的情况下传递，并且现有的 4 字节行为仍受支持。

由索引模型根据 Issue 内容生成。