New Project Type - User Secrets

[dBianchii]

Description 📣

This PR introduces a new project type: User Secrets. With this feature, users can securely store sensitive information, such as:

• Login credentials (e.g., for websites and apps)
• Credit card details
• Secure notes

This marks the MVP phase of Infisical's evolution into a competitor for leading password and secret managers like Bitwarden, 1Password and others

Features:

• Multi-project support
• Creating, reading, updating and deleting credentials
• Sorting credentials by name

Type ✨

• Bug fix
• New feature
• Improvement
• Breaking change
• Documentation

Tests 🛠️

• Tried inserting incorrect/bad values on inputs for both inserting and updating user inputs.
• Made sure that values would be encrypted, and only the same user that created the value can edit their credentials.

# Here's some code block to paste some code snippets

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• I have read the contributing guide, agreed and acknowledged the code of conduct. 📝