docs: Add XML documentation to BuildingBlocks APIs #112

Job	Run time
Build	1m 39s
Test - Multitenancy.Tests	25s
Test - Generic.Tests	26s
Test - Auditing.Tests	26s
Test - Architecture.Tests	27s
Test - Identity.Tests	24s
Publish Release (NuGet + Containers)	-1s
Publish Dev Containers	-1s
	3m 45s

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