Terraform-aws-slack-alerts improvements sugestions

[EreminAnton]

Change alert thershold in cost anomaly detection to INT
Budget alerts Change limit amount in budget alerts to INT
Chatbot thoughts: If user wants to give other policy in to chatbot, give him this opportunity Chatbot configruration: change name from test

[EreminAnton]

EventBridge events that may be worth getting notifications on:
Create / close account
CreateOrganizationalUnit, InviteAccountToOrganization