feat: add `adb run` command with activitymanager

[lavafroth]

Changes

• LocalCommand and USBCommand now have respective variants for "run"
• Both these impls run the shell command am start INTENT
• Added new trait method run_activity for ADBDeviceExt
• run_activity requires a package name and an associated activity to invoke
• The library ships with a default implementation of run_activity which invokes an intent using the am start command.

Closes #16

[lavafroth]

In addition to this, would you be open to using monkeyrunner to start an activity in the case where a user supplies a package name without an intent? Alternatively we could just default to MainActivity which applies to most apps.

[cocool97]

Thanks for the PR, can you add this feature to adb_client as well ? Currently it is only available to the CLI.

I would have seen something like run_application that only takes a package name as parameter and run_activity that takes both package name and activity to start. run_application could call run_activity with default activity name.

What do you think about it ?

[lavafroth]

Sure, I can add this to the library side. Please correct me if I'm wrong but to extract the default activity of an app, we'd first need to parse its apk, right?

[cocool97]

As a library we let users fill these two fields, users will have to know what main activity names their applications have.

APK parsing could be done using other libraries

[lavafroth]

I have edited the PR description to reflect the changes committed.