Add support for dividend reinvestments and stock distributions

[oyarzun]

Thanks for your work on improving the Fidelity conversion plugin.

Hopefully Fidelity will offer an OFX download, but in the mean time here are some additional changes to support converting the CSV files.

Note: the stock distributions require an update to ofxstatement. I will push another PR to your repo.

[zhou13]

Sorry for missing your PR. Could you explain the TRANSFER entry? I asked ChatGPT and it says

In an OFX investment statement, TRANSFER usually is not the value of <TRNTYPE>

If it is for stock distributions, I suppose

set_income("DIST")

will be more reasonable? Correct me if I am wrong, but according to my understanding, distribution is very similar to diviends.

[zhou13]

Updated comments above.

[oyarzun]

A TRANSFER in the OFX specification can be used for a stock distribution since the stock is transferred into the brokerage account.

see kedder/ofxstatement#378

   set_income("DIST")

That would set the INCOMETYPE to DIST which is not part of the OFX specification.
https://schemas.liquid-technologies.com/ofx/2.1.1/?page=incomeenum.html

[zhou13]

Thank you for the clarification. In https://dev.wealthaccess.com/wp-content/uploads/2024/02/QW_DataMappingGuide.pdf (Page 52), it suggests using RETOFCAP + BUYSTOCK for a spin-off, which I think is what you encountered. Let me know what you think. I can also merge this as is, as RETOFCAP might not be well supported by downstream applications.