feat: install apk

[itsspriyansh]

Description

This PR:

1. Adds the functionality to install an APK in a target device (AVD / Real device). The feature can be accessed with the new install subcommand as shown below:

npx @nightwatch/mobile-helper android install --app [--path <path_to_apk>] [--deviceId <target_device_id>]

2. Adds a new execBinaryAsync function instead of reusing the previously present execBinarySync function. This was done because synchronous flow cannot catch the error thrown by the adb install command. execBinaryAsync function runs the command asynchronously allowing us to handle any possible errors.

Screencast.from.29-07-24.03.06.52.PM.IST.webm

[garg3133]

Can you also specify the reason for creating a new execBinaryAsync function instead of reusing the execBinarySync function in the description of the pull request (for documentation purposes)?

[itsspriyansh]

@garg3133 PR updated

[garg3133]

Looks good now, thanks!

[garg3133]

Ah, sorry about changing the showMissingBinaryHelp function. I thought of making it more universal by moving the binary not found message to the caller function because the main error message and its style could be specific to the caller. But I see that it can very well be reused as it is in other subcommands.

Putting it back in another commit.