Prepare for release 3.4.0-rc0 (#225)

## Release notes: usage and product changes
Update release notes and version

## Implementation

Author: farost

RELEASE_NOTES_LATEST.md

@@ -7,38 +7,29 @@ Documentation: https://typedb.com/docs/drivers/
 Available from https://crates.io/crates/typedb-protocol
 
 ```sh
-cargo add typedb-protocol@3.2.0
+cargo add typedb-protocol@3.4.0-rc0
 ```
 
 #### For Node.js through npm
 
 Available from https://www.npmjs.com/package/typedb-protocol
 
 ```sh
-npm install typedb-protocol@3.2.0
+npm install typedb-protocol@3.4.0-rc0
 ```
 or
 ```sh
-yarn add typedb-protocol@3.2.0
+yarn add typedb-protocol@3.4.0-rc0
 ```
 
 
 ## New Features
-- **Rework transaction options**
-  Reintroduce transaction options available in TypeDB 3.x. Introduce query options for query-specific configuration.
+- **Introduce database import and export protocol messages**
+  Add `migration` protocol messages for usage in database import and database export operations:
+  * a unidirectional `database_export` stream from a TypeDB server to export a specific database, similar to TypeDB 2.x;
+  * a bidirectional `databases_import` stream between a client and a server to import an exported 2.x/3.x TypeDB database into a TypeDB 3.x server from a client.
 
-  Remove unused Logic-related messages.
-  
-  
-- **Add sign-in request for authentication token retrieval**
-  A new mechanism of authentication tokens has been introduced to replace the old way of sending usernames and passwords through the network with every request.
-  
-  Instead, all user credentials (currently, it's usernames and passwords) are sent only:
-  * as a part of `connection_open` request for authentication and authorization, with a temporary token returned;
-  * as a part of `sign_in` request for sign ins within an established connection (to change the user or to get a new authentication token).
-  Then, all further requests are expected to be authenticated only by temporary, less sensitive tokens. 
-  
-  The approach is extensible to other credential types that can be introduced in the future.
+  The format of migration items used for these operations is an extended version of TypeDB 2.x's migration items, so it is backward compatible with 2.x database files. **Important:** it's not intended to import 3.x databases into 2.x servers.
 
 
 
@@ -49,4 +40,5 @@ yarn add typedb-protocol@3.2.0
 
 
 ## Other Improvements
+
 

VERSION

@@ -1 +1 @@
-3.2.0
+3.4.0-rc0