Add IndexedDb support to help with larger workspaces in the browser about earthstar HOT 5 CLOSED

There's also a mess of filesystem APIs in browsers which mostly only work in Chrome, so we should probably avoid them.

https://developer.mozilla.org/en-US/docs/Web/API/File_System_Access_API (no firefox support)

https://developer.mozilla.org/en-US/docs/Web/API/File_and_Directory_Entries_API/Introduction (limited firefox support)

https://developer.mozilla.org/en-US/docs/Web/API/File_and_Directory_Entries_API/Firefox_support

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There's also the Service Workers Cache API to consider.

Service workers only work when served over https or localhost. If you're trying to self-host a webapp on a raspberry pi, you're probably stuck on http and can't use service workers.

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Other ways to avoid the 5mb localStorage limit

• Run your app in node and use StorageSqlite which has no size limits. Serve a webapp from there over localhost to the browser.
• Make an Electron app which should be able to use StorageSqlite

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IndexedDb resources

Tutorials

• https://developers.google.com/web/ilt/pwa/working-with-indexeddb
• https://hackernoon.com/use-indexeddb-with-idb-a-1kb-library-that-makes-it-easy-8p1f3yqq
• https://javascript.info/indexeddb
• https://developer.mozilla.org/en-US/docs/Web/API/IndexedDB_API/Using_IndexedDB

Libraries

• idb - tiny wrapper that mostly adds Promise support
• dexie - another wrapper to make it easier to use
• fake-indexeddb - in-memory version of indexeddb, works in node, maybe useful for testing, but unsure how accurate it is at replicating browser bugs/quirks. Can also be used underneath dexie and maybe idb

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We could also build on top of RXDB which is very fancy, but it in turn is built on top of pouchdb which has its own indexes and data sync behavior, so this would be a stack that's too tall.

Could... Earthstar... be a storage adapter... underneath RXDB??? Unknown

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