Merged PR 348: #2462 - Refactor of DatabaseClient and DatabaseServer

## Summary
Refactor of `DatabaseClient` and `DatabaseService` to update how connection IDs are generated. These are now provided by DatabaseService when establishing a connection.
Creation of `DatabaseClientConnection` class. This is used by `DatabaseClient` to hold a dictionary of active db connections.

## Test process
Tests have been updated to reflect the changes and all pass

## Checklist
- [X] PR is linked to a **work item**
- [X] **acceptance criteria** of linked ticket are met
- [X] performed **self-review** of the code
- [X] written **tests** for any new functionality added with this PR
- [X] updated the **documentation** if this PR changes or adds functionality
- [ ] written/updated **design docs** if this PR implements new functionality
- [X] updated the **change log**
- [X] ran **pre-commit** checks for code style
- [X] attended to any **TO-DOs** left in the code

Related work items: #2462

tests/integration_tests/system/red_applications/test_data_manipulation_bot_and_server.py

@@ -10,7 +10,7 @@ from primaite.simulator.network.hardware.nodes.host.server import Server
 from primaite.simulator.network.hardware.nodes.network.router import ACLAction, Router
 from primaite.simulator.network.transmission.transport_layer import Port
 from primaite.simulator.system.applications.application import ApplicationOperatingState
-from primaite.simulator.system.applications.database_client import DatabaseClient
+from primaite.simulator.system.applications.database_client import DatabaseClient, DatabaseClientConnection
 from primaite.simulator.system.applications.red_applications.data_manipulation_bot import (
     DataManipulationAttackStage,
     DataManipulationBot,
@@ -141,8 +141,10 @@ def test_data_manipulation_disrupts_green_agent_connection(data_manipulation_db_
     server: Server = network.get_node_by_hostname("server_1")
     db_server_service: DatabaseService = server.software_manager.software.get("DatabaseService")
 
+    green_db_connection: DatabaseClientConnection = green_db_client.get_new_connection()
+
     assert db_server_service.db_file.health_status is FileSystemItemHealthStatus.GOOD
-    assert green_db_client.query("SELECT")
+    assert green_db_connection.query("SELECT")
     assert green_db_client.last_query_response.get("status_code") == 200
 
     data_manipulation_bot.port_scan_p_of_success = 1
@@ -151,5 +153,5 @@ def test_data_manipulation_disrupts_green_agent_connection(data_manipulation_db_
     data_manipulation_bot.attack()
 
     assert db_server_service.db_file.health_status is FileSystemItemHealthStatus.COMPROMISED
-    assert green_db_client.query("SELECT") is False
+    assert green_db_connection.query("SELECT") is False
     assert green_db_client.last_query_response.get("status_code") != 200

tests/integration_tests/system/red_applications/test_ransomware_script.py

@@ -10,7 +10,7 @@ from primaite.simulator.network.hardware.nodes.host.server import Server
 from primaite.simulator.network.hardware.nodes.network.router import ACLAction, Router
 from primaite.simulator.network.transmission.transport_layer import Port
 from primaite.simulator.system.applications.application import ApplicationOperatingState
-from primaite.simulator.system.applications.database_client import DatabaseClient
+from primaite.simulator.system.applications.database_client import DatabaseClient, DatabaseClientConnection
 from primaite.simulator.system.applications.red_applications.ransomware_script import (
     RansomwareAttackStage,
     RansomwareScript,
@@ -144,12 +144,13 @@ def test_ransomware_disrupts_green_agent_connection(ransomware_script_db_server_
 
     client_2: Computer = network.get_node_by_hostname("client_2")
     green_db_client: DatabaseClient = client_2.software_manager.software.get("DatabaseClient")
+    green_db_client_connection: DatabaseClientConnection = green_db_client.get_new_connection()
 
     server: Server = network.get_node_by_hostname("server_1")
     db_server_service: DatabaseService = server.software_manager.software.get("DatabaseService")
 
     assert db_server_service.db_file.health_status is FileSystemItemHealthStatus.GOOD
-    assert green_db_client.query("SELECT")
+    assert green_db_client_connection.query("SELECT")
     assert green_db_client.last_query_response.get("status_code") == 200
 
     ransomware_script_application.target_scan_p_of_success = 1
@@ -159,5 +160,5 @@ def test_ransomware_disrupts_green_agent_connection(ransomware_script_db_server_
     ransomware_script_application.attack()
 
     assert db_server_service.db_file.health_status is FileSystemItemHealthStatus.CORRUPT
-    assert green_db_client.query("SELECT") is True
+    assert green_db_client_connection.query("SELECT") is True
     assert green_db_client.last_query_response.get("status_code") == 200