Update remote_encryption builder to take encryption object instead of option

[avinassh]

In builder pattern, it is better to take the Object itself instead of Option<Object>. So

pub fn remote_encryption(mut self, encryption_context: Option<EncryptionContext>) -> Builder<T> {}

changed to

pub fn remote_encryption(mut self, encryption_context: EncryptionContext) -> Builder<T> {}

This follows the existing practices, and consistent with the code.

[Copilot]

Pull Request Overview

This PR refactors the builder API so that remote_encryption takes an EncryptionContext directly instead of an Option<EncryptionContext>, and updates all call sites and examples to match.

• Change remote_encryption signature in all builder impls to accept EncryptionContext and wrap it in Some(...).
• Update the sync protocol code to conditionally call remote_encryption when an Option<EncryptionContext> is present.
• Revise the example (encryption_sync.rs) to demonstrate the new usage pattern.

Reviewed Changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated no comments.

File	Description
libsql/src/database/builder.rs	Updated remote_encryption method signatures for RemoteReplica, SyncedDatabase, and Remote; adjusted sync protocol code to apply it conditionally.
libsql/examples/encryption_sync.rs	Modified example to construct the builder first and then call .remote_encryption(...) only when needed.

Comments suppressed due to low confidence (3)

libsql/src/database/builder.rs:309

• Add a unit test to verify that calling remote_encryption correctly sets inner.remote_encryption to Some(encryption_context) for each builder variant.

        pub fn remote_encryption(mut self, encryption_context: EncryptionContext) -> Builder<RemoteReplica> {

libsql/examples/encryption_sync.rs:30

• [nitpick] The variable name enc is abbreviated and may be unclear; consider using encryption_context or context to match the API and improve readability.

    if let Some(enc) = encryption {

libsql/src/database/builder.rs:307

• [nitpick] The remote_encryption method is duplicated across three different builder implementations; consider extracting a shared trait or helper macro to DRY up this logic.

        /// Set the encryption context if the database is encrypted in remote server.