Update Bank_Reserves example for mesa 3.1.4

The current code for the bank_reserves example doesn't work with the latest mesa version i.e `3.1.4`.

The following changes are supposed to be made to ensure that it works perfectly well:
- update the portrayal
- Add Solara support for visualization
- remove mesa modular server implementation
- update `requirements.txt`

Start in the bank_reserves example and inspect its current portrayal, visualization setup, and requirements.txt against Mesa 3.1.4. Update the example to use the requested portrayal and Solara support, remove the Mesa modular server implementation, and verify that requirements.txt reflects the working dependencies.

Written by the indexing model from the issue text.