Add notifications roles to security plugin for cluster permissions

[joshuali925]

1. Need to send PR to add roles to security and dashboards security plugin, cluster permissions list:

    "cluster:admin/opensearch/notifications/configs/create",
    "cluster:admin/opensearch/notifications/configs/delete",
    "cluster:admin/opensearch/notifications/configs/get",
    "cluster:admin/opensearch/notifications/configs/update",
    "cluster:admin/opensearch/notifications/events/get",
    "cluster:admin/opensearch/notifications/feature/channels/get",
    "cluster:admin/opensearch/notifications/feature/send",
    "cluster:admin/opensearch/notifications/features",
    "cluster:admin/opensearch/notifications/send"

2. Need to send PR to dashboards security plugin

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[qreshi]

Default roles were added in opensearch-project/security#1847