Replace Headers AGI with diaplan functions

[Kaian]

trafficstars

Type Of Change

• [ ] Small bug fix
• [X] New feature or enhancement
• [ ] Breaking change

Checklist:

• [X] Commits are named and have tag following commit rules
• [X] Commits are split per component (schema, web/admin, kamusers, agis, ..)
• [ ] Changes have been tested locally
• [ ] Fixes an existing issue (Fixes #XXXX)
• [ ] Upport from existing Pull request #XXXX

Description

This is part of a new set of enhancements to optimize call process for high load environments. This agi was being called for each outbound call and some scenarios, like ringall Huntgroups, can generate a lot of calls at the same time, spawning a PHP for each of them.

Additional information