RSDK-9174: add app wrappers

[purplenicole730]

Adding all the app wrappers.

Notes:

• Added a new common.go file to include constants and variables used by multiple clients.
• Shadow types are in app_proto_conversions.go and registry_proto_conversions.go. Some shadow types are also used in ML Training, so these were kept secret to use as the ML Training client. Types that are used in both app and ML training will go into common.go, while everything else that remains will go into app_client.go and mltraining_client.go. When the ML training app wrappers are added, app_proto_conversions.go and registry_proto_conversions.go will be deleted.
• Talking to @benjirewis and @jckras, we came to the conclusion that for TailRobotPartLogs, we can give the stream object itself to the user so that the user does what they want with it, whether they want to make it a channel or not. This is common practice in Go.

[stuqdog]

One suggested type change for the Authorization struct and some questions around code safety, otherwise this lgtm.

[stuqdog]

lgtm!