APIM: Add v2 SKU

[ross-p-smith]

This PR adds v2 SKU of API Service

Relates to #2747

Special notes for your reviewer:

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• this PR contains documentation
• this PR contains tests

[codecov-commenter]

Codecov Report

Attention: 1225 lines in your changes are missing coverage. Please review.

Comparison is base (5bac6d1) 53.50% compared to head (e487dde) 53.50%.

Files	Patch %	Lines
...ment/v1api20230501preview/named_value_types_gen.go	52.44%	223 Missing and 49 partials ⚠️
...nagement/v1api20230501preview/product_types_gen.go	58.76%	146 Missing and 35 partials ⚠️
.../v1api20230501preview/api_version_set_types_gen.go	57.03%	133 Missing and 32 partials ⚠️
.../v1api20230501preview/policy_fragment_types_gen.go	55.84%	121 Missing and 30 partials ⚠️
...anagement/v1api20230501preview/policy_types_gen.go	53.46%	112 Missing and 29 partials ⚠️
...t/v1api20230501preview/product_policy_types_gen.go	53.46%	112 Missing and 29 partials ⚠️
...ment/v1api20230501preview/product_api_types_gen.go	45.74%	105 Missing and 29 partials ⚠️
...i20230501preview/service_api_spec_arm_types_gen.go	33.33%	4 Missing ⚠️
...view/service_api_version_set_spec_arm_types_gen.go	33.33%	4 Missing ⚠️
...30501preview/service_backend_spec_arm_types_gen.go	33.33%	4 Missing ⚠️
... and 7 more

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3673      +/-   ##
==========================================
  Coverage   53.50%   53.50%              
==========================================
  Files        1364     1397      +33     
  Lines      461340   477149   +15809     
==========================================
+ Hits       246829   255307    +8478     
- Misses     177522   183286    +5764     
- Partials    36989    38556    +1567     

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[matthchr]

This looks great to me.

[matthchr]

/ok-to-test sha=b7ae9b8

[matthchr]

/azp run

[azure-pipelines]

Azure Pipelines successfully started running 1 pipeline(s).

[matthchr]

/ok-to-test sha=b7ae9b8

[matthchr]

/ok-to-test sha=b7ae9b8

[matthchr]

/ok-to-test sha=e487dde

[matthchr]

Our CI SP expired - once that's fixed we'll merge this.

[tomkerkhove]

Oh the certainties in life!