* Adds ab test controller with a fullScreenVsPopup test
* Add migration for fullScreenVsPopup state
* Move abtest state under an 'abtests' object.
* MetaMask shows fullScreen group of a/b test unapproved txs in a full browser tab
* Ensure cancel metrics event in confirm-transaction-base.component.js is sent in all cases
* Switch to existing tab for unapproved tx if it exists when opening in full screen
* Send metrics event for entering a/b test from confirm screen
* Fix lint, unit and integration tests related to a/b test code
* Remove unnecessary tabs.query call in triggerUiInNewTab
The `accounts` prop of `SignatureRequest` was throwing a PropType
warning because `accounts` was an object instead of an array. It looks
like when the `mergeProps` function was added in #6340, the ownProps
were accidentally set to override the state props.
The now ignored props have been removed from the parent `ConfirmTxScreen`
component as well. `conversionRate` was identical to the one retrieved
in `SignatureRequest`, and `selectedAddress` differed only in the
fallback behaviour when `state.metamask.selectedAddress` does not exist;
it will now default to the first account instead (as was the original
behavior, prior to #6340).
* Adds 4byte registry fallback to getMethodData() (#6435)
* Adds fetchWithCache to guard against unnecessary API calls
* Add custom fetch wrapper with abort on timeout
* Use opts and cacheRefreshTime in fetch-with-cache util
* Use custom fetch wrapper with timeout for fetch-with-cache
* Improve contract method data fetching (#6623)
* Remove async call from getTransactionActionKey()
* Stop blocking confirm screen rendering on method data loading, and base screen route on transactionCategory
* Remove use of withMethodData, fix use of knownMethodData, in relation to transaction-list-item.component
* Load data contract method data progressively, making it non-blocking; requires simplifying conf-tx-base lifecycle logic.
* Allow editing of gas price while loading on the confirm screen.
* Fix transactionAction component and its unit tests.
* Fix confirm transaction components for cases of route transitions within metamask.
* Only call toString on id if truthy in getNavigateTxData()
* Fix knownMethodData retrieval and data fetching from fourbyte
