Adapt `spf13/cobra` library for improving CLI in efficient way

[Harsh4902]

Reason/Context

• Adding a new command/flag is a tedious task with current code of the Microcks-CLI. Also, we have to write help for new command/flag explicitly in help command.
• spf13/cobra library can help us to do these things efficiently.

Description

• Currently, we are not using the spf13/cobra library and are instead adding commands and flags using the flag package in Golang.
• For future improvements, using spf13/cobra will make it easier to add support for new commands and flags efficiently.
• It will also make it easier for new contributors to contribute to Microcks-CLI.

Related Issue(s) : #97

Implementation ideas

No response

[github-actions]

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[lbroudoux]

I think that this one can now be closed thanks to #125. What do you think?

[Harsh4902]

Yes, I am closing it now.