[EVM Reader] Standardize Retry Policy use

[fmoura]

📚 Context

Retry policy is only being used on calls to the Blockchain thought EthClient. This same policy should be applied to every possible request and Databases calls as well

✔️ Solution

Apply Retry Policy on EthClient and Database connection and also on top of calls to the Database

📈 Subtasks

• [ ] Check the need and apply Retry Policy on top of EthClient creation
• [ ] Apply Retry Policy on Database connection
• [ ] Apply Retry Policy on Database calls