Feature Request: set_record + set_records

get_all_records()
return nicely formatted dictionaries (thanks!)

**set_record()** (new feature)
inset one dictionary to google sheet (values under right heading)

**set_records()** (new feature)
inset list of dictionaries to google sheet (values under right heading)

Start by tracing the existing get_all_records() entry point and how it maps sheet headings to dictionaries. Define set_record() for one dictionary and set_records() for a list, preserving values under matching headings, then verify the behavior against a Google Sheet.

Written by the indexing model from the issue text.