[Cashtab] [Alias] Disable alias registrations if alias server is unavailable
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Description

[Cashtab] [Alias] Disable alias registrations if alias server is unavailable

Summary:
T3062

Depends on D13503

This diff prevents alias registrations in the event of the alias-server being down.

Users can still view their registered aliases and send XEC to aliases in their existing cache.

Test Plan:

change currency.aliasSettings.aliasServerBaseUrl in ticker.js to an incorrect url
enable alias in ticker.js
npm start
note the getAliasServerState exception and ensure the existing aliases in cache have not been wiped out.
navigate to Alias.js and ensure the registered aliases list is still intact with an exception thrown for getPendingAliases
verify in localForage's cashtabCache.aliasCache object is still intact
attempt to register a new alias and ensure the Unable to connect to alias server, please try again later error notification is displayed
attempt to register an alias already registered in cache and ensure the same alias-server error is displayed
navigate to Send.js and SendToken.js and ensure aliases in cache are still resolving to their corresponding addresses
wait for a new block to be found and ensure this does not wipe out the aliases in cache either
revert currency.aliasSettings.aliasServerBaseUrl to the original url and ensure no issues with onchain alias count polling and alias registrations are enabled
disable alias in ticker.js and ensure no regression to existing functions