Suite of cli and perms bugfixes

[stopachka]

Made a series of tweaks to CLI, from what I noticed from the user session with Zack.

Small changes

1. npx instant-cli init now detects expo, and shares the env var for expo (EXPO_PUBLIC...)
2. We fixed a bug where if the user had no rules, we generated a perms file with an erroneous semicolon.
3. Added instant-cli to react-native-expo, so we can test it there too.
4. Made $default an allowed key in InstantRules.ts, and in Perms Editor
5. Made it so $default is no longer a reserved name on the backend

Controversial Change: replace imports for @instantdb/react-native

I realized that CLI has been broken for react-native. The main reason, was that when we ran loadConfig, we would evaluate instant.schema.ts and instant.perms.ts in a node environment.

Inside the file, we would improve from our library like so:

import { i } from '@instantdb/react-native' 

The problem is, @instantdb/react-native imports react-native libraries, which fail in node.

There were a few options I thought of for getting around this:

A) Make @instantdb/core a peer

We could make @instantdb/core a peer library, instead of a dependency. We could then import { i } from '@instantdb/core'. This works great, but it would now force the user to install two libraries to get going. i.m.o that's a bit of a sadder experience. Perhaps it's worth it down the line, but I didn't want support for CLI to be the reason we switch.

B) Conditional entry points

We could have detected whether we were in a CLI environment, and had @instantdb/react-native run different entry points. I thought this would be changing the library too much though, just for CLI

C) Have a separate entry point for CLI

We could have a cli.ts file, which doesn't import react-native code. We could either tell the user to use it explicitly, or to just replace calls of @instantdb/react-native with @instantdb/react-native/dist/cli. I ended up doing this replace approach.

@dwwoelfel @nezaj @tonsky

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[dwwoelfel]

3 seems like the best approach to me too.

LGTM!