Export all public functions of `sc-service` (#4457)

https://github.com/paritytech/polkadot-sdk/pull/3166 made private
functions used in `spawn_tasks()` public but forgot to add them in
exported functions of the crate.

---------

Co-authored-by: Oliver Tale-Yazdi <oliver.tale-yazdi@parity.io>
Co-authored-by: Bastian Köcher <git@kchr.de>

prdoc/pr_4457.prdoc

+# Schema: Polkadot SDK PRDoc Schema (prdoc) v1.0.0
+# See doc at https://raw.githubusercontent.com/paritytech/polkadot-sdk/master/prdoc/schema_user.json
+
+title: "sc-service: export all public functions"
+
+doc:
+  - audience: Node Dev
+    description: |
+      A PR #3166 converted private functions used in `spawn_tasks()` to public to make it possible to have custom 
+      implementation of the `spawn_tasks()`. However, not all functions were included in the list of exports from 
+      `sc-service` crate.
+
+crates: 
+  - name: sc-service
+    bump: minor

substrate/client/service/src/lib.rs

@@ -54,10 +54,11 @@ use sp_runtime::traits::{Block as BlockT, Header as HeaderT};
 
 pub use self::{
 	builder::{
-		build_network, new_client, new_db_backend, new_full_client, new_full_parts,
-		new_full_parts_record_import, new_full_parts_with_genesis_builder, new_wasm_executor,
-		spawn_tasks, BuildNetworkParams, KeystoreContainer, NetworkStarter, SpawnTasksParams,
-		TFullBackend, TFullCallExecutor, TFullClient,
+		build_network, gen_rpc_module, init_telemetry, new_client, new_db_backend, new_full_client,
+		new_full_parts, new_full_parts_record_import, new_full_parts_with_genesis_builder,
+		new_wasm_executor, propagate_transaction_notifications, spawn_tasks, BuildNetworkParams,
+		KeystoreContainer, NetworkStarter, SpawnTasksParams, TFullBackend, TFullCallExecutor,
+		TFullClient,
 	},
 	client::{ClientConfig, LocalCallExecutor},
 	error::Error,