[🔌 Provider]: Add BMC ITSM provider

[cweiland]

Describe the provider you want to add
BMC Helix ITSM is one of biggest CMDB and ITSM product on the market.

This provider can be used for :

• Topology data
• Create incidents

Describe your use case
I want to test and hope use Keep to maybe replace my current Hypervisor
To do this, I need to have the possibility to populate service topology and create incidents :)

Are you already using Keep?
No, but maybe sooon 💯

Additional context
(https://www.bmc.com/it-solutions/bmc-helix-itsm.html)

[talboren]

@cweiland thank you for this issue! happy to invite you to our Slack community - can we maybe discuss this integration over there?