feat(policy): add cli crud for attributes

[jrschumacher]

Add CLI CRUD for attributes w/ values

Assuming export NAMESPACE_ID=752cbd4d-9fa4-4c8e-853c-0dfa2ebc6956

# Create attribute wwithout values
tructl attributes create \
       --name "test" \
       --rule "ANY_OF" \
       --namespace $NAMESPACE_ID
       
# Create attribute with single value
tructl attributes create \
       --name "test1" \
       --rule "ANY_OF" \
       --namespace $NAMESPACE_ID \
       --values "test-a"

# Create attribute with multi value
tructl attributes create \
       --name "test1" \
       --rule "ANY_OF" \
       --namespace $NAMESPACE_ID \
       --values "test-a" \
       --values "test-b" \
       --values "test-c"

[jakedoublev]

Are we holding off on an implementation for this until the policy api issues are handled? If so, that makes sense to me.

Policy api issues: [https://github.com/opentdf/platform/issues/115, https://github.com/opentdf/platform/issues/114, https://github.com/opentdf/platform/issues/108]

[jrschumacher]

@jakedoublev yea I should have added a comment to let users know it's in flight

[jakedoublev]

Do we want to use the same --json global output flag and "full output" suggestion prompt as with subject mappings?

[jrschumacher]

Yes I'll add this as a separate ticket. Still thinking about how to abstract this in a way where we don't have to think about it.

I think I'll have to do some reflection.