cli: replace `workspaces` command with `info`

[mvidalgarcia]

The new info command just reads the response from the server-side and prints it as title:value items. This way, the endpoint can be easily extended to include more info with no changes in the client needed.

closes #568 closes #567

Supersedes https://github.com/reanahub/reana-client/pull/569

TODO:

• [x] Clarify and execute actions from here: https://github.com/reanahub/reana-client/pull/569#discussion_r724216509
• [x] r-commons release to make the tests pass. Install https://github.com/reanahub/reana-commons/pull/302 locally when testing

[codecov-commenter]

Codecov Report

Merging #570 (ab94fba) into master (3624b59) will increase coverage by 0.88%. The diff coverage is 81.25%.

@@            Coverage Diff             @@
##           master     #570      +/-   ##
==========================================
+ Coverage   58.19%   59.07%   +0.88%     
==========================================
  Files          20       20              
  Lines        2399     2419      +20     
==========================================
+ Hits         1396     1429      +33     
+ Misses       1003      990      -13     

Impacted Files	Coverage Δ
reana_client/cli/ping.py	61.11% <40.00%> (-4.11%)	:arrow_down:
reana_client/api/client.py	45.01% <100.00%> (+1.02%)	:arrow_up:
reana_client/cli/utils.py	71.26% <100.00%> (+0.50%)	:arrow_up:
reana_client/cli/workflow.py	63.65% <100.00%> (+0.68%)	:arrow_up:
reana_client/utils.py	74.74% <100.00%> (+6.70%)	:arrow_up:
reana_client/version.py	100.00% <100.00%> (ø)