feat(rust): improvements for commands' output to standardize their formatting

[adrianbenavides]

Output changes

• list commands: I've removed the header that was shown in a box. These commands now print the items without any header
• tcp-inlet|outlet create: I changed the formatting of the output to use a "narrative" format, instead of showing a list of values.
• I extended the docs for some arguments (global arguments and command specific arguments)
• All arguments that have json output now print the json struct in a single line (the pretty-print can be done with jq if the user needs it)

Fixes

• tcp-inlet|outlet create: the allow argument was set as positional, and it should be a named argument. I also changed the alias to match the arg name we use at policy create (expression instead of policy_expression)