refactor: Refactor CLI of Flank-scripts

[piotradamczyk5]

Fixes #1567

This PR refactor CLI layer of Flank scripts as described in command overview and SDD

Test Plan

How do we know the code works?

1. Directories looks like:

├── cli
│   ├── Main.kt
│   ├── assemble
│   │   ├── AssembleCommand.kt
│   │   ├── FlankCommand.kt
│   │   ├── GoCommand.kt
│   │   ├── android
│   │   │   ├── AndroidCommand.kt
│   │   │   └── AppCommand.kt
│   │   └── ios
│   │       ├── EarlGreyCommand.kt
│   │       ├── ExampleCommand.kt
│   │       ├── FlankExampleCommand.kt
│   │       ├── FtlCommand.kt
│   │       ├── GameLoopExampleCommand.kt
│   │       ├── IosCommand.kt
│   │       ├── RunFtlLocalCommand.kt
│   │       └── TestPlansExample.kt
│   ├── dependencies
│   │   ├── DependenciesCommand.kt
│   │   ├── InstallXcPrettyCommand.kt
│   │   ├── SetupIosEnvCommand.kt
│   │   ├── UniversalFrameworkCommand.kt
│   │   ├── UpdateBinariesCommand.kt
│   │   └── UpdateCommand.kt
│   ├── firebase
│   │   ├── CheckForSdkUpdatesCommand.kt
│   │   ├── FirebaseCommand.kt
│   │   ├── GenerateClientCommand.kt
│   │   └── UpdateApiCommand.kt
│   ├── github
│   │   ├── CopyIssuePropertiesCommand.kt
│   │   ├── DeleteOldTagCommand.kt
│   │   ├── DeleteReleaseCommand.kt
│   │   ├── GitHubCommand.kt
│   │   └── MakeReleaseCommand.kt
│   ├── integrationtests
│   │   ├── IntegrationTestsCommand.kt
│   │   └── ProcessResultCommand.kt
│   ├── linter
│   │   ├── ApplyToGitHooksCommand.kt
│   │   ├── ApplyToIdeCommand.kt
│   │   └── LinterCommand.kt
│   ├── release
│   │   ├── DeleteSnapshotCommand.kt
│   │   ├── GenerateReleaseNotesCommand.kt
│   │   ├── NextTagCommand.kt
│   │   ├── ReleaseCommand.kt
│   │   └── SyncWithMavenCentralCommand.kt
│   └── testartifacts
│       ├── DownloadCommand.kt
│       ├── LinkCommand.kt
│       ├── PrepareCommand.kt
│       ├── RemoveRemoteCommand.kt
│       ├── ResolveCommand.kt
│       ├── TestArtifactsCommand.kt
│       ├── UnzipCommand.kt
│       ├── UploadCommand.kt
│       └── ZipCommand.kt

2. Command are named and used like described in docs/flank-scripts/command_overview.md

Checklist

• Documented

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Timestamp: 2021-02-09 15:43:22
Buildscan url for ubuntu-workflow run 551801772

[adamfilipow92]

• Code looks good
• Build works

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