Add support for commodity and account entries.

[savingsandloan]

The proposed changes would add support for Commodity & Account entries

• Readers: Add get_commodity_entries and get_account_entries methods to readers (ofxreader, csvreader, csv_multitable_reader)
• Common Importers: Add configurable checks of self.include_commodities and self.include_accounts to investments.py (any other relevant importers?)
• Common Importers: Add extract_commodities and extract_accounts methods that would be called within extract if associated include_ is set to true.

An earlier approach to this in fidelity_csv_old was commits:

• savingsandloan@c17331f
• savingsandloan@a713313

It would largely be the same except of course carry the new approach to build_metadata as done in #28

[redstreet]

Thanks, this helps! How about this commit instead? Would it solve all your needs?

[savingsandloan]

Technically should. It does introduce some questions of why other libreader methods (e.g. get_balance_positions) are there (and leads to questions around the framing around ofx), but let me see how this works.

[redstreet]

Merged to main.