How to connected to target cluster via pegasus shell config

## General Question
I have read the documentation, but can not found the way that use `./run.sh shell --config my_config.ini` to connected to my target cluster. In other word, I don't know how to config it.
I tried to use the config file named `my_cluster.cfg` which I used to deployed cluster. But it not work,with the error like this:
```
W2024-08-30 11:17:43.874 (1725016663874826365 42119) : overwrite default thread pool for task RPC_CM_QUERY_PARTITION_CONFIG_BY_INDEX_ACK from THREAD_POOL_META_SERVER to THREAD_POOL_DEFAULT
Pegasus Shell 2.4.5-without-slog
Type "help" for more information.
Type "Ctrl-D" or "Ctrl-C" to exit the shell.

cannot find factory '' with factory type provider
the following 2 factories are registered:
nativerun (type: provider)
simulator (type: provider)
Please specify the correct factory name in your tool_app or in configuration file
got signal id: 11
./run.sh: line 1724: 42119 Segmentation fault ./pegasus_shell ${CONFIG} $CLUSTER_NAM
```
And I read the code , I think we should get the section named[meta] to get meta list , I just konw how to write the xxxx.ini file

Start with the `./run.sh shell --config my_config.ini` invocation and the `pegasus_shell` configuration handling mentioned in the issue. Check how the `[meta]` section and `tool_app` or provider factory settings are expected to be written, then verify that the shell connects without the factory error or segmentation fault.

Written by the indexing model from the issue text.