Add bulk events to canopsis2x-events-apiv2.lua and replace downtime request

[devcanopsis]

Description

This update allows bulk submission of pbehavior data to improve Downtime transmission performance in Canopsis versions 24.04.8, 24.10.x, and 25.04.x.

Type of change

• Patch fixing an issue (non-breaking change)
• New functionality (non-breaking change)
• Breaking change (patch or feature) that might cause side effects breaking part of the Software

Target serie

• 22.10.x
• 23.04.x
• 23.10.x
• 24.04.x
• 24.10.x
• master

Checklist

Community contributors & Centreon team

• I have followed the coding style guidelines provided by Centreon
• I have commented my code, especially new classes, functions or any legacy code modified. (docblock)
• I have commented my code, especially hard-to-understand areas of the PR.
• I have rebased my development branch on the base branch (master, maintenance).