[MM-12362] Add CLI command 'config show' (#9536) (#9564)

* Add the subcommand by creating a new Command instance.

* Implemented the structure of the subcommand function.

* Register our new command

* Write some helper functions

* finish the pretty print function

* write some test for config show

* Refactor and extract the tab printing functionality in its own function

* Use app.Config() to create our config object & accept incoming changes

* Removed reading the file, make helper functions return string and perform printing inside the command

* Remove the previous code for checking presence of arguments and use 'cobra.NoArgs()' instead

* Remove named return and instead declare the variable and then return it.

* Remove printTab function and simplify printing out tabs using strings.Repeat

* Add some functions to test the output

* Update the usage and remove a comment

* Update the print

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