added way to build without ee features

[Wojtach]

#if COUCHBASE_ENTERPRISE

Exclude code from build if COUCHBASE_ENTERPISE is false

[gemini-code-assist]

Summary of Changes

Hello @Wojtach, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request modifies the build process to allow building the Couchbase SDK without enterprise features. It achieves this by wrapping enterprise-specific code, particularly encryption key handling, within conditional compilation blocks that are only included when the COUCHBASE_ENTERPRISE flag is defined.

Highlights

• Conditional Compilation: Introduced #if COUCHBASE_ENTERPRISE blocks to exclude code related to enterprise features when the COUCHBASE_ENTERPRISE flag is not defined during compilation.
• Encryption Key Handling: Wrapped the encryption key setting and changing logic within the #if COUCHBASE_ENTERPRISE block in DatabaseManager.swift.

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[gemini-code-assist]

Code Review

This pull request introduces conditional compilation to exclude enterprise-only encryption features from non-enterprise builds. The changes are functionally correct in that they remove the features. However, my review identifies two high-severity issues where these features are silently disabled, which could mislead developers into a false sense of security. I've suggested changes to provide explicit feedback—either by logging a warning or throwing an error—when an attempt is made to use these enterprise features in a non-enterprise build. This will improve clarity and prevent potential security vulnerabilities.

[gemini-code-assist]

When building without COUCHBASE_ENTERPRISE, the encryptionKey from the configuration is silently ignored. This can be misleading, as a developer might assume the database is being encrypted when it is not. This could lead to sensitive data being stored unencrypted without any warning.

To prevent this, it's better to provide explicit feedback. Since this function doesn't throw, consider adding an #else block to print a warning to the console.

Suggested change

	#if COUCHBASE_ENTERPRISE
	let key = EncryptionKey.password(encKey)
	databaseConfiguration.encryptionKey = key
	#endif
	#if COUCHBASE_ENTERPRISE
	let key = EncryptionKey.password(encKey)
	databaseConfiguration.encryptionKey = key
	#else
	// Using print as a fallback, but a dedicated logger would be better if available.
	print("Warning: Encryption is an enterprise-only feature. The provided encryptionKey will be ignored.")
	#endif

[gemini-code-assist]

In a non-enterprise build, calling changeEncryptionKey currently does nothing and returns successfully. This is misleading and potentially dangerous, as the caller would assume the encryption key has been changed or removed when, in fact, no operation was performed.

Since this function can throw, it's better to throw an error in the non-enterprise case to clearly signal that the feature is not available. This prevents any misunderstanding about the database's encryption state.

        #if COUCHBASE_ENTERPRISE
            if let newKeyString =  newKey {
                let encryptionKey = EncryptionKey.password(newKeyString)
                try database.changeEncryptionKey(encryptionKey)
                return
            }
            try database.changeEncryptionKey(nil)
        #else
            throw DatabaseError.unknownError(message: "Changing the database encryption key is an enterprise-only feature.")
        #endif