Pagination improvements

[jesusgn90]

Hello team, this PR fixes #645

Brief summary:

• Monitoring module is now paginating agents by 500 items per request in order to fit new Wazuh API limits (Limit maximum result of API wazuh#875)
• Wazuh table directive has been improved:
  • Single request has a 500 items limit
  • If we are in an empty page, it fetchs 500 more items and so on
  • Already fetched items are not re-fetched each time we are requesting data
  • Tables works the same way, this modification doesn't modify their behaviour, it only modifies the internal pagination
  • Some duplicated code has been placed into a common function

Regards,
Jesús

[havidarou]

LGTM!