Form validation and Chlu reviews

[fazo96]

PR Content:

• add validation to form for submitting transactions (closes Add form validation to require vendor address #48)
• show real reviews in customer transaction history
• show real reviews in vendor profile
• show real reviews in vendor transaction history (closes As a vendor, when I receive a payment, I should also see the review associated with it, if any. #47)
• handle updates for reviews being read
• ability to update own reviews (closes As a customer, I should be able to add a follow up review, i.e. edit the review #49)
  • show edit button if the review is editable by current user
  • when editing, show form with field for review_text and rating
  • when saving, submit the actual review update
• removed all test data for reviews

[fazo96]

I removed all test data regarding reviews in chlu-demo, instead now real reviews show up in all the screens (Vendor Profile, Vendor Wallet, Customer Transactions).

Customers can also update a review if they have the right orbitDb key in the localstorage, in that case the Edit button shows up and the review text and star rating can be changed

When a review is edited, the actuall call is performed through ChluIPFS so the review gets updated for real!

Also, when the demo reads reviews it checks for updates and when they arrive the review data in the redux store gets updated automatically

All of this needs a little cleanup, more testing and there are some changes we should make to ChluIPFS to improve how this works (ref: ChluNetwork/chlu-ipfs-support#46), I think the developer experience of using ChluIPFS needs to be better.