feat: Add isDatabaseEncrypted utility function to detect encrypted databases

[NiKrause]

Problem

When opening an encrypted OrbitDB database without encryption options, OrbitDB doesn't throw errors or emit error events. This makes it difficult to detect if a database is encrypted and needs a password, especially when opening databases via URL.

Solution

Added isDatabaseEncrypted() function that detects encrypted databases by checking if entries exist but their values are undefined:

• Encrypted DB without encryption: entries have hashes but values are undefined (encrypted data cannot be read)
• Unencrypted DB: entries have hashes AND readable values
• Empty DB: returns false (cannot determine)

This enables applications (like simple-todo) to detect encrypted databases and prompt for password when needed.

Changes

• Added isDatabaseEncrypted() function to src/index.js
• Added comprehensive tests verifying the detection logic
• Test covers encrypted, unencrypted, and empty database scenarios

Usage

import SimpleEncryption, { isDatabaseEncrypted } from '@orbitdb/simple-encryption'

// Try opening database without encryption
const db = await orbitdb.open(address, {})

// Check if it's encrypted
const isEncrypted = await isDatabaseEncrypted(db)

if (isEncrypted) {
  // Show password modal
  const password = await promptForPassword()
  const encryption = await SimpleEncryption({ password })
  await db.close()
  const encryptedDb = await orbitdb.open(address, { encryption: { data: encryption } })
}

[NiKrause]

the current solution only works for data encryption not for replication encryption! I am going to think on another encryption detection for it! Please bare with me!

[NiKrause]

I added an encryption detection signal to the isDatabaseEncrypted utility function for replication encryption too!

Still looks more like a workaround then a correct solution. Anyhow, I am going to leave this here, if someone needs it or finds it useful.

Same time adding the missing issue: #2

[NiKrause]

closing because issue is more complex then thought initially