feat: Remote Control Support

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Add remote control support along with builtin remote controlling command.

Changes Introduced

• addition of new package internal/remote
• add remote coral command to root command
• addition of environment var parsing at main called SLIDES_REMOTE_SOCKET. Presence of this triggers listening of remote control command at given UNIX socket path. This can then be used by sides remote socket [flags] [command] command to control that slide session.

Use Case

• Navigating and Controlling Slide sessions using external processes eg: scripts, to use slides along with other workflows as well.

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DEMO