Add tcld commands to support new MRN API

[yux0]

What was changed

Add tcld commands to support new MRN API

tcld namespace delete-region - Delete a region from the Temporal Namespace

USAGE:
   tcld namespace delete-region [command options] [arguments...]

OPTIONS:
   --request-id value, -r value  The request-id to use for the asynchronous operation, if not set the server will assign one (optional)
   --namespace value, -n value   The namespace hosted on temporal cloud
   --region value, --re value    New region to add to the namespace.
   --cloud-provider value        The cloud provider of the region. Default: aws (default: "aws")
   --help, -h                    show help

tcld namespace update - Update Temporal namespace attributes

USAGE:
   tcld namespace update [command options] [arguments...]

OPTIONS:
   --request-id value, -r value  The request-id to use for the asynchronous operation, if not set the server will assign one (optional)
   --namespace value, -n value   The namespace hosted on temporal cloud
   --disable-auto-failover       Disable Temporal managed failover on this multi replicas namespace. (default: false)
   --help, -h                    show help

Why?

Add tcld commands to support new MRN API

Checklist

1. Closes

2. How was this tested:

3. Any docs updates needed?