Read data from dataframe

[manycoding]

Support at least dataframe - which will allow to read the data locally from whatever source (csv, json, be it remote or local)

Currently the library relies on having _key to report items by it. So the implementation could look like:

1. Figure out a simple api (fastai - datablock? like

items = Items.from_csv (items.from_job)
schema = Schema.get_schema(schema)
items.report_all(schema)

# And to keep it granular enough so it can be used in Spidermon
arche.rules.duplicates.find_by(items.df, ["name", "title"])

2. Add _key column. Maybe it's easier to make _key as index if it's present and report index
3. _type. So far _type nobody really needed it since we can use filters.