Use generated openapi julia client

[sverhoeven]

TODO

• get working
• add happy tests
• add wrong usage tests
• get rid of EOFError from server logs when running tests

[codecov]

Codecov Report

Attention: Patch coverage is 87.60563% with 220 lines in your changes missing coverage. Please review.

Project coverage is 87.61%. Comparing base (61b6052) to head (fd95287).
Report is 10 commits behind head on julia-tests.

Files with missing lines	Patch %	Lines
...emoteBMI.jl/src/client/apis/api_UnstructuredApi.jl	74.41%	22 Missing ⚠️
...I.jl/src/client/apis/api_VariableInformationApi.jl	76.25%	19 Missing ⚠️
...teBMI.jl/src/server/models/model_ProblemDetails.jl	0.00%	18 Missing ⚠️
...moteBMI.jl/src/client/apis/api_ExchangeItemsApi.jl	71.92%	16 Missing ⚠️
...teBMI.jl/src/client/apis/api_TimeInformationApi.jl	71.92%	16 Missing ⚠️
RemoteBMI.jl/src/client/apis/api_IRFApi.jl	71.73%	13 Missing ⚠️
...teBMI.jl/src/client/apis/api_GridInformationApi.jl	73.68%	10 Missing ⚠️
RemoteBMI.jl/src/client/apis/api_NURCApi.jl	73.68%	10 Missing ⚠️
...MI.jl/src/client/apis/api_UniformRectilinearApi.jl	73.68%	10 Missing ⚠️
RemoteBMI.jl/src/Server.jl	94.19%	9 Missing ⚠️
... and 19 more

Additional details and impacted files

@@               Coverage Diff                @@
##           julia-tests      #16       +/-   ##
================================================
+ Coverage        45.87%   87.61%   +41.73%     
================================================
  Files               24       42       +18     
  Lines              800     1776      +976     
================================================
+ Hits               367     1556     +1189     
+ Misses             433      220      -213     

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