Enhance: add encryption to LLM keys

[ashrafchowdury]

Description:

Implemented encryption on the LLM keys to enhance the security of the app. The implementation ensures that the keys are stored and transmitted securely, reducing the risk of unauthorized access and potential breaches.

Changes:

1. Installed crypto-js library for encryption decryption.
2. Implemented AES-256 encryption algorithm.
3. Created a new function named getAllDecryptedProviderLlmKeys to get decrypted LLM keys.
4. Created a new env variable to encrypt and decrypt the LLM keys.

Notes:

1. Add NEXT_PUBLIC_LLM_ENCRYPTION_KEY variable to your .env.local file with a random unique key.

Issue

Closes #1879

[vercel]

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Name	Status	Preview	Comments	Updated (UTC)
agenta	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Jul 23, 2024 1:13am

[bekossy]

@mmabrouk @aakrem
This PR has been reviewed and approved

[mmabrouk]

Outdated. We are now planning to have a vault in the backend to resolve this