Parse AdditionalAddresses

[farmio]

don't use them in the result yet.

IP Secure interfaces use BusInterface to transport name and leave the name attribute of AdditionalAddress tags an empty string. I don't know how BusInterface[@AddressIndex] relates to an AdditionalAddress tag.

Also there are no communication objects for AdditionalAddress so maybe they should have their own root key in the final result. A BusInterface may have Connectors containing their Associations as GroupAddressRefId - which doesn't really add to our current reference schema (GroupAddress -> CommunicationObject and Device -> CommunicationObject) 😬

[codecov]

Codecov Report

Merging #204 (ed58421) into main (836beff) will increase coverage by 0.15%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main     #204      +/-   ##
==========================================
+ Coverage   97.84%   98.00%   +0.15%     
==========================================
  Files          19       19              
  Lines         697      701       +4     
==========================================
+ Hits          682      687       +5     
+ Misses         15       14       -1     

Impacted Files	Coverage Δ
xknxproject/loader/project_loader.py	98.96% <100.00%> (-0.02%)	⬇️
xknxproject/models/models.py	100.00% <100.00%> (+0.64%)	⬆️