Separate get environment and list environment function

[shivam-Purohit]

closes #194

This will also ensure better unit testing and future end 2 end testing the application.

Following is the result we get in litmusctl list chaos-environments

Enter the Project ID: 8adf62d5-64f8-4c66-ab53-63729db9dd9a

CHAOS ENVIRONMENT ID	CHAOS ENVIRONMENT NAME		CREATED AT			CREATED BY

last			last				56074-07-04 03:23:44 +0530 IST	admin

shivamnewenv		shivamnewenv			55962-10-01 15:05:45 +0530 IST	admin

newenvironmenttest	newenvironmenttest		55912-12-01 10:55:23 +0530 IST	admin

shivamenv		shivamenv			55908-04-03 16:42:51 +0530 IST	admin

Press Enter to show more environments (or type 'q' to quit): q

Following is the output for get litmusctl chaos-environment

Enter the Project ID: 8adf62d5-64f8-4c66-ab53-63729db9dd9a

Enter the Environment ID: last

CHAOS ENVIRONMENT DETAILS

CHAOS ENVIRONMENT ID	 last

CHAOS ENVIRONMENT NAME	 last

CHAOS ENVIRONMENT Type	 NON_PROD

CREATED AT		 56074-07-04 03:23:44 +0530 IST

CREATED BY		 admin

UPDATED AT		 56074-07-04 03:23:44 +0530 IST

UPDATED BY		 admin

CHAOS INFRA IDs	 

TAGS			 newtag, testtag

I added all the all the fields we could query in the get command.

[shivam-Purohit]

with the latest push for delete environment
i will also refactor that according to new query.

[Nageshbansal]

@shivam-Purohit, as previously discussed, we've decided to merge the 'get' and 'list' commands, merging them into a single 'get' command to display information. Therefore, I'm closing this PR as resolved with reference to #206