New parser for Bangladesh

[MuffinCompiler]

Issue

Closes #5370

Description

Rewrite the parser for Bangladesh to make use of the new data source, supporting consumption, generation, and exchanges with Northeastern and Eastern India.
Data is being updated only in batches, therefore, most of the time, it does not fulfill the real-time criteria of <2h delay. (But it can from time to time!) Also historical data can be fetched. I added capacities to the config file from their last annual report.

Supported commands:
poetry run test_parser BD generation
poetry run test_parser BD consumption
poetry run test_parser "BD->IN-NE" exchange
poetry run test_parser "BD->IN-EA" exchange
All work with --target_datetime YYYYMMDD as well.

Data also contains loadshed information, probably not important for us. The sum of consumption sources does not add up to the given total generation, I put the rest in 'unknown'.
Weird is also that the capacity for coal in the annual report (page 13) is lower than the current generation. Not sure what to make out of this.

Double check

• I have tested my parser changes locally with poetry run test_parser "zone_key"
• I have run pnpx prettier --write . and poetry run format to format my changes.

[VIKTORVAV99]

Thanks for the PR!

Overall this looks good and is working.
There is just a few small things that needs to be addressed. I think I got most of them but the type related changes might require further adjustment down the line.

[VIKTORVAV99]

LGTM! 🎉

Thanks for creating the new parser! It's very much appreciated!
I pushed some final changes required by our build and CI pipeline (and a small fix for a type error). I hope that's okay.

@mathilde-daugy I know you are still working on estimating the India zones and perhaps the exchange data from this parser might be of use. There are historical data available since 2015-04-19.