Changes to Create a UAC connection

added the new optional request property bridge_generate_comfort_noise_on_cn

added the optional property data/bridge_generate_comfort_noise_on_cn to the response with the 201 status

the data/external_uac_settings/username response property's maxLength was increased from 32 to 256 for the response status 201

the external_uac_settings/auth_username request property's maxLength was set to 256

added the new optional request property external_uac_settings/user_agent

added the new optional request property inbound/sip_region

the external_uac_settings/username request property's maxLength was increased from 32 to 256

added the optional property data/external_uac_settings/user_agent to the response with the 201 status

added the optional property data/inbound/sip_region to the response with the 201 status

endpoint added