Refactor the user vuex module

[pkarw]

What is the motivation for adding / enhancing this feature?

In order to prepare VS for 2.0 release we're refactoring some vuex modules in order to keep the good practices:

• remove state write operations from the actions,
• replace state read operations with vuex getters,
• preferably migrate from events-based logic to vuex actions,
• remove notifications from vuex (spawnNotification),
• remove rootStore references,
• extract network calls to data-resolveres (as introduced in the [WIP] Refactor catalog module #2890)

What are the acceptance criteria

• resetPassword, login, register, update, me, getOrdersHistory network calls refactoed to helpers + then to data-resolvers
• remove callback_event event's based logic - use just the then(helperFnc) instead
• try to remove spawnNotification move the notifications one level higher (to the UI)
• replace all rootStore calls with the context instead (for example context.rootState)
• remove the calls to history and me from login (it should be extremly simple) - the sessionAfterAuthorized should be called instead - by some observer (plugin?) on the user token
• replace all fetch calls with Task api calls

Can you complete this feature request by yourself?

• YES
• NO

Which Release Cycle state this refers to? Info for developer.

Pick one option.

• This is a normal feature request. This should be available on https://test.storefrontcloud.io and then after tests this can be added to next Vue Storefront version. In this case Developer should create branch from develop branch and create Pull Request 2. Feature / Improvement back to develop.
• (Pick this option only if you're sure) This is an important improvement request for current Release Candidate version on https://next.storefrontcloud.io and should be placed in next RC version. In this case Developer should create branch from release branch and create Pull Request 3. Stabilisation fix back to release.
• (Pick this option only if you're sure) This is a critical improvement request for current Stable version on https://demo.storefrontcloud.io and should be placed in next stable version. In this case Developer should create branch from hotfix or master branch and create Pull Request 4. Hotfix back to hotfix.

Additional information

[alinadivante]

@andrzejewsky Two things to fix:

1. When user registers new account, there is info "You are logged in" but he isn't logged in.
   
   Expected results:
   User should be automatically logged in (it works on https://demo.storefrontcloud.io)

2. When I change manually token in dev console (shop/user/current-token) and open again my account and refresh page - there is info "Consumer is not authorized to access self" but user is still logged in.
   

Expected results:
shop/user/current-token should be replaced with the valid user token from Magento.
"Consumer is not authorized to access self" error shouldn't occur.

[pkarw]

starting point for this issue (it's not related directly to refactor): https://github.com/DivanteLtd/vue-storefront/blob/76211f7d036a04b6db5eda31d1402753e5c58372/core/lib/sync/task.ts#L78

[pkarw]

Related: #3237

[pkarw]

Please make sure you've got the proper version of vue-storefront-api deployed - https://github.com/DivanteLtd/vue-storefront-api/tree/release/v1.10 or https://github.com/DivanteLtd/vue-storefront-api/tree/develop @patzick

[andrzejewsky]

Fixed here: #3271 everything should works now.