This commit adds the `--source` option to the `install tool` command. This
option is equivalent to the option of the same name for the `restore` command.
The option is forwarded to the underlying restore operation.
Fixes#8226.
* compose all the parts
* Fix on obtain and shim maker for better end to end experience
* Fix error when there is space in the middle of path of nuget config
* Fix path in profile.d is the tmp home path during install
* better handle of ~home
* remove profile.d file in uninstall script
* Fix test since it looks up current directory
* folder structure inside nupkg to tools/TFM/RID/mytool.dll
* Add check for config file existence
* Rename name space to Microsoft.DotNet.ShellShim
* Rename name space to Microsoft.DotNet.ToolPackage
