Use native ClickHouse protocol to insert samples

[bnaecker]

We added support for the native ClickHouse protocol over TCP in #6584. This tracks using it to insert samples from oximeter. This might need a bit of work on the protocol client itself, since it's not entirely clear how to add data in the query ("in line" or in a following data block?). We might also want to add code that converts our database model types into and out of the native format (ideally, converting a sequence of those values to a single Block for the most bang for our TCP buck).