Flux to Redux: Plans, Domains & Purchases

[scruffian]

As outlined in #5046 we need to move the /plans, /purhcases and /domains to Redux. The work can be broken down like this:

Plans

• Move "plansList" data to redux and remove localStorage dependency. Framework: add QueryPlans data component #5444
• Add QuerySitePlans component. Framework: add query plans component #4933
• Remove plans flux stores. Framework: Remove the obsolete lib/plans-list #10155
• Create QueryPlans component. Framework: add QueryPlans data component #5444

Domains

• Create QueryDomains component.
• Stop using StoreConnection in domain management.
• Remove domains flux stores.

Purchases

• Move existing reducer in client/lib/purchases/reducer to client/state/ Purchases: Add state.purchases.items reducer #6317
• Create QueryPurchases component. Purchases: Add state.purchases.items reducer #6317
• Stop using StoreConnection in purchases. Purchases: Add state.purchases.items reducer #6317
• Remove purchases flux stores. Purchases: Use state.purchases to render /purchases #6647
• Remove unused purchases reducer

This issue is to investigate how much work this will be and how we will approach it.

[drewblaisdell]

I added a checkbox to this and #5046 to add a purchases reducer.

Edit: Actually, the current Flux store is a reducer, so we can probably just move/update it.

[fabianapsimoes]

@scruffian is "Remove plans flux stores" done or still pending?

Removing Purchases since we're done with the things under that label.

[scruffian]

The last checkbox for plans is still pending...

[klimeryk]

Just FYI, there's already a QueryDomains-like component: https://github.com/Automattic/wp-calypso/blob/ba85297f6f21d08cd2c693040b8c2c3b2ac03185/client/components/data/query-site-domains/README.md So hopefully you can re-use it here. The old store is slowly being removed from domains code - glad to see this push! Please add @Automattic/cobalt to reviewers when you get this part - would love to help test and review 🙇

Edit: for reference, here are the two related PRs where I recently removed calls to this old store: #46418 and #47060

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