feat: Add support to forward SubscriptionGroupIds

[mmustafa-tse]

Summary

• We currently support forwarding subscriptionGroupIds mapped via user attributes in our Braze S2S forwarder only, a customer mentioned that Braze support this feature in their Braze and requested this as a feature to our kits, refer to our docs regarding subscription group ids

Testing Plan

• Was this tested locally? If not, explain why.
• E2E and unit tested

Reference Issue (For mParticle employees only. Ignore if you are an outside contributor)

• Closes https://go.mparticle.com/work/SQDSDKS-7211