Add more population weighting targets

[soubhikbarari]

Updated TODOs Jun 16 2023

Functionality:

• have an option to specify keep.margins and remove.margins to keep/remove margins in the passed-in target
• auto.map option if it makes sense, i.e. allow user to turn off auto-mapping dataframe columns to population variables
• have an option to save a custom target distribution, or list of dataframes that the user is created, e.g. save_target

Specific distributions to save out the target files in inst/extdata/targets -- drawing from all the files we've created already from various projects -- and then also to turn into functions (in order of priority):

• us_smallbiz_acs_23 (or something similar) for the small business weights that Zoe created
• us_aapi_acs_19 (or something similar) for the weights we use for AAPI Data
• tx_acs_19, ma_acs_19, etc. etc. for each state gen pop
• us_acs_teens_19 or something similar for US teens (these weights should be on the dashboard backend folders somewhere)

[soubhikbarari]

Adding this here, it would be awesome to be able to weight to this population of survey of LGBTQ Americans (we have done surveys with partners interested in this!)

https://williamsinstitute.law.ucla.edu/publications/lgbt-demo-comp-pop-surveys/