feat: adds CRUD samples for GS realms

[telpirion]

Adds the following region tags:

cloud_game_servers_create_realm
cloud_game_servers_get_realm
cloud_game_servers_list_realms
cloud_game_servers_delete_realm

Fixes #20 🦕

[codecov]

Codecov Report

❗ No coverage uploaded for pull request base (master@036d74c). Click here to learn what that means.
The diff coverage is 80%.

@@           Coverage Diff            @@
##             master     #21   +/-   ##
========================================
  Coverage          ?   4.23%           
========================================
  Files             ?      10           
  Lines             ?    5264           
  Branches          ?       0           
========================================
  Hits              ?     223           
  Misses            ?    5041           
  Partials          ?       0

Impacted Files	Coverage Δ
src/index.ts	0% <0%> (ø)
samples/list_realms.js	100% <100%> (ø)
samples/create_realm.js	100% <100%> (ø)
samples/get_realm.js	100% <100%> (ø)
samples/delete_realm.js	100% <100%> (ø)

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