[master < ] Enable runtime configurable settings

[andrejtonev]

• Add run-time configurable timeout.
• Set the default Bolt server name and allow run-time change.
• Add log-level
• Add also-log-to-stderr

[master < Task] PR

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• Provide the full content or a guide for the final git message

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closes #474

[Ignition]

Does the move from gflags remove them from --help?

[andrejtonev]

@vpavicic

Added new run-time configurable settings:

1. Server name
2. Query execution timeout
3. Log level
4. Log to stderr

1. Bolt server name can now be changed at run-time by executing the following query
   SET DATABASE SETTING 'server.name' TO 'new-name'. The updated name persist between session. The user can override the name by updating the settings as above, or by defining the command-line argument as before.
   The default server name has also been updated to Neo4j/v5.11.0 compatible graph database server - Memgraph.

2. To change the query execution timeout in seconds run SET DATABASE SETTING 'query.timeout' TO '1234'.
   The updated timeout takes effect on subsequent queries. The query timeout value persists between session and can be updated via the above query or command-line argument.

3. Log level can be set at run-time by calling SET DATABASE SETTING 'log.level' TO 'TRACE'.
   Allowed values are: TRACE, DEBUG, INFO, WARNING, ERROR, CRITICAL.
   The log level is not session persistent and will take on the value of the command-line argument at startup (default: WARNING).

4. User can enable/disable logging to stderr by calling SET DATABASE SETTING 'log.to_stderr' TO 'true/false'. The value does not persist between session and will always take on the value of the command-line argument (default: false).