feat: add info_get_peers rpc as poc

[ryo-casper]

Closes #416

TODO

• Check if this section should be moved to casper-js-types module.

[codecov]

Codecov Report

Merging #415 (7231dca) into feat-4.0 (fe670ee) will decrease coverage by 1.68%.
The diff coverage is 81.39%.

Additional details and impacted files

@@             Coverage Diff              @@
##           feat-4.0     #415      +/-   ##
============================================
- Coverage     82.54%   80.86%   -1.68%     
============================================
  Files            29       31       +2     
  Lines          1369     1437      +68     
  Branches        145      157      +12     
============================================
+ Hits           1130     1162      +32     
- Misses          178      209      +31     
- Partials         61       66       +5     

Components	Coverage Δ
casper-js-api	∅ <ø> (∅)
casper-js-types	∅ <ø> (∅)
casper-js-keys	∅ <ø> (∅)