Adding more fields to Loyalty Profile field group (CJM-115123)

[iewilliam]

Add more fields to loyalty profile schema to support more loyalty use cases around challenges and rewards, as requested. Also fix tier upgradeDate to be of type date-time.

Challenges

A loyalty challenge is a time bound challenge that usually has tasks for the user to finish with a reward for finishing on time. A typical example would be spend more than $20 over the next week to receive 100 extra loyalty points.

This PR adds a "challenges" field that lists such loyalty challenges that the user has signed up for and tracks their progress in them.

Rewards

This PR also adds a rewards section that tracks different reward channels for the user:

• Coupons: Tracks coupons that has been assigned to the user. these are usually time bound and has some kind of redemption limit.
• Badges: achievement badges earned by the user through various activities.
• Giveaways: These are very much like coupons but to be redeemed against a partner.
• Referrals: Referral rewards earned by the user for referring others to the loyalty program