* rename types and variables from package namespaces to package source mapping
* fix build failures
* rename few more test names
* replace namespace with source mapping
* fix public api
* fix and rename dotnet integration test
* remove unnecessary file
* feedback
* rename PackageSourceMappingConfiguration to PackageSourceMapping
* rename PackageNamespacesConfiguration to PackageNamespaces
* fix source mapping typo
* fix log messages
* fix typos and variable names
* PR feedback
* change parameter name from term to packageId
* use var and rename PackageSourceMappingConfigurationUtility to PackageSourceMappingUtility