Create new command rit set env

[kaduartur]

Description

The rit set context command has been deprecated and we will now use the new rit set env command which has the same functionality as the old command.

How to verify it

It's a small part of the #554 issue, a separate pull request was created to facilitate code review

[codecov-io]

Codecov Report

Merging #688 (2d00cdb) into feature/switch_context_to_env (d19bcf2) will increase coverage by 0.04%.
The diff coverage is 81.57%.

@@                        Coverage Diff                        @@
##           feature/switch_context_to_env     #688      +/-   ##
=================================================================
+ Coverage                          81.27%   81.31%   +0.04%     
=================================================================
  Files                                108      108              
  Lines                               3706     3715       +9     
=================================================================
+ Hits                                3012     3021       +9     
  Misses                               506      506              
  Partials                             188      188              

Impacted Files	Coverage Δ
pkg/cmd/delete_context.go	33.33% <0.00%> (ø)
pkg/cmd/set_env.go	47.22% <62.50%> (ø)
pkg/cmd/cmd.go	80.00% <100.00%> (+8.57%)	⬆️
pkg/cmd/set.go	100.00% <100.00%> (ø)
pkg/cmd/show_context.go	87.50% <100.00%> (ø)
pkg/commands/builder.go	89.38% <100.00%> (ø)
pkg/credential/finder.go	76.47% <100.00%> (ø)
pkg/credential/setter.go	55.55% <100.00%> (ø)
pkg/env/remover.go	89.47% <100.00%> (ø)
pkg/env/setter.go	89.47% <100.00%> (ø)

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