[meta] Credit Card & Addresses support

[grigoryk]

Storage & Delegates

• concept-storage interfaces for the storage layer and its delegates for use w/ GeckoRuntime concept-storage: credit card & address storage #9453
• browser-storage-sync:
  • a new SyncableStore implementation of the credit cards storage backed by the A-S APIs - similar to SyncableLoginsStorage (see storage initialization, use of unlock) browser-storage-sync implementation for credit cards and addresses storage #9454
  • similarly, storage implementation of the Addresses storage. We'll need this for syncing, even thought we may not use it directly just yet. browser-storage-sync implementation for addresses #9458
  • gecko storage and validation delegate implementations for credit cards Gecko credit card storage delegates #9455
  • browser-engine (beta, nightly, release): delegate wrapper(s) and type conversions for geckoview.Autocomplete.CreditCardStorageDelegate

Sync

• services-firefox-accounts: introduce new SyncEngine types for credit cards and addresses to service/fxa/sync/* Introduce SyncEngine types for credit card/addresses syncing #9456

Autofill prompts

• feature-prompts integration feature-prompts: credit cards #9457

Fenix

• Hook up storage layers and delegates Hook up credit cards and addresses storage layers and delegates fenix#17538
• Wire-in a new SyncEngines - BackgroundServices to enable syncing, AccountsSettingsFragment to enable toggling the engine, etc Expose credit card & addresses syncing in Account Settings UI fenix#17537

Credit Card management UI in Fenix

• TBD credit cards view/edit/manage UI screen(s) accessible from Settings Credit Cards management UI fenix#17539

Addresses management UI in Fenix

• TBD addresses view/edit/manage UI screen(s) accessible from Settings Addresses management UI fenix#17540

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