Log CSV location is difficult to obtain

[christopherwallis]

Would be good to be able to easily reference the location of the log file to add additional data to the directory (or file). Eg chunks of data from dataloggers.

Currently the location is stored/accessible as fixate.reporting.csv.writer.reporting.csv_path once initialised

[clint-lawrence]

I can think of a couple of things we might like to do for this.

• Have a function that returns the currently log file directory
• Have a function that returns an open file handle to a newly created file in the right place. We might need to pass in a suffix to add to the log file name?

Not sure if it makes sense for this to go into fixate.config or fixate.reporting. Probably leaning to fixate.config. And then fixate.reporting would use the same/similar api to get a file path to write the standard log file to.