Start and Stop command using cobra cli

[Luxxgit2k4]

Adding the start and stop commands for microcks-cli using cobra cli. The modules have also been updated

microcks-cli start : Starts the server in the background by pulling the docker image with the container name "microcks-server"

microcks-cli stop: Stops the server.

Also updated main.go to prevent overwriting the existing commands.

Future implementation:
Adding viper for managing configuration, for example allowing the users to select the port to run the microcks server.
Migrating the other commands into cobra cli for easy management. Cobra cli generates a help page based on the commands built without even need for building the help command.

[github-actions]

👋 @Luxxgit2k4

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[Harsh4902]

@Luxxgit2k4 Thank you for this PR. Adaption of cobra for our CLI is completed. I am happy to here from you regarding start and stop commands.

[github-actions]

This pull request has been automatically marked as stale because it has not had recent activity 😴

It will be closed in 30 days if no further activity occurs. To unstale this pull request, add a comment with detailed explanation.

There can be many reasons why some specific pull request has no activity. The most probable cause is lack of time, not lack of interest. Microcks is a Cloud Native Computing Foundation project not owned by a single for-profit company. It is a community-driven initiative ruled under open governance model.

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[lbroudoux]

Now done in 1.x branch.