[💡]: Implementation of OnTel Functions

[Gincules]

Description

Add the following functions including documentation on https://github.com/Gincules/avmtools/wiki

• OnTel
  • Enable-AvmOnTel
  • Enable-AvmOnTelByIndex
  • Enable-AvmOnTelConfigByIndex
  • Enable-AvmOnTelDeflection
  • Get-AvmOnCallBarringEntry
  • Get-AvmOnTelBarringEntryByNum
  • Get-AvmOnTelCallBarringList
  • Get-AvmOnTelCallList
  • Get-AvmOnTelDectHandsetInfo
  • Get-AvmOnTelDectHandsetList
  • Get-AvmOnTelDeflection
  • Get-AvmOnTelDeflectionById
  • Get-AvmOnTelInfo
  • Get-AvmOnTelInfoByIndex
  • Get-AvmOnTelNumberOfDeflection
  • Get-AvmOnTelNumberOfEntry
  • Get-AvmOnTelPhonebookEntry
  • Get-AvmOnTelPhonebookEntryUid
  • Get-AvmOnTelPhonebookList
  • Get-AvmOnTelPhonelist
  • New-AvmOnTelPhonebook
  • Remove-AvmOnTelByIndex
  • Remove-AvmOnTelCallBarringEntryUid
  • Remove-AvmOnTelPhonebook
  • Remove-AvmOnTelPhonebookEntry
  • Remove-AvmOnTelPhoneEntryByUid
  • Set-AvmOnTelCallBarringEntry
  • Set-AvmOnTelConfig
  • Set-AvmOnTelDectHandsetPhonebook
  • Set-AvmOnTelPhonebookEntry
  • Set-AvmOnTelPhonebookEntryUid