feat: add addr_to_addr_info util for converting addr to addr_infos

[bdraco]

create_connection usually wants one local_addr, but we support multiple because internally cpython does as well so as long as they are in addr_info format so we need a util for easy conversions.

# Convert a local_addr to local_addr_infos
local_addr_infos = addr_to_addr_infos(("127.0.0.1",0))

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (d7e5df1) 100.00% compared to head (dbb3099) 100.00%.
Report is 1 commits behind head on main.

Additional details and impacted files

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  Coverage   100.00%   100.00%           
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  Files            4         4           
  Lines          128       148   +20     
  Branches        36        40    +4     
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+ Hits           128       148   +20     

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