Add batching for line protocol input

[srebhan]

Use Case

When writing data to InfluxDB continuously it is preferable to send those metrics as batches for performance reasons. However, currently the API does not support automatic batching of line protocol data.

Expected behavior

Be able to batch line-protocol data similar to #107

Actual behavior

No such feature

Additional info

No response

[srebhan]

Clarify if line protocol input is a big string or a slice of strings or byte array.