Catch errors from unsupported/disabled features in browsers

[zachferland]

Catch and relay useful error when indexeddb, localstorage, or in general the env does not meet the requirements of our library.

Also add docs on requirements, so that devs can handle themselves and relay that error to user. We can throw it so a dev understand its better, but they have still have to consume it and relay it in a useful way to an end user, so that user can maybe try diff env.

[zachferland]

Links to #759

This also applies to to iframes we are using for 3id-connect and ipfs data caching, but those are more explicitly handling this already (or will) with fallbacks