cli: Make tinygo help experience more consistent with go help #3739

[bjornpagen]

• Improve tinygo help command output by streamlining layout and command descriptions
• Reorganize commands and help topics alphabetically, moving info and targets to help topics
• Create a new 'flags' help topic that contains all the flag details
• Use 'text/tabwriter' for consistent formatting and structuring of the help output
• Remove "No command-line arguments supplied." to match go

Credit to @m-kru for layout

TinyGo is a Go compiler for small places.
version: 0.28.0-dev

Usage:

	tinygo <command> [arguments]

The commands are:

        build          compile packages and dependencies
        clean          empty cache directory (/Users/bjornpagen/Library/Caches/tinygo)
        env            list environment variables used during build
        flash          compile and flash to the device
        gdb            run/flash and immediately enter GDB
        help           print this help text
        list           run go list using the TinyGo root
        lldb           run/flash and immediately enter LLDB
        monitor        open communication port
        run            compile and run immediately
        test           test packages
        version        show version

Use "tinygo help <command>" for more information about a command.

Additional help topics:

        flags          general flags
        info           show info for specified target
        targets        list targets

Use "tinygo help <topic>" for more information about that topic.

For more details, see https://tinygo.org/docs/reference/usage/

[paralin]

Looks like a good improvement!