Revert "[Feature] Deprecation messages for invalid imports"

[MHHukiewitz]

Reverts #94

[github-actions]

The 'aleph-message==0.4.1' change in setup.cfg could be considered as BLUE, as it is unlikely to introduce bugs and doesn't involve any major refactoring or changes that would affect other parts of the codebase significantly.

However, there are a few RED indicators:

• The removal of raise NotImplementedError in abstract methods from aleph/sdk/client/abstract.py could indicate some new features or modifications to existing logic that might require deeper review and understanding of the codebase.
• Changes in 'eth_abi==4.0.0b2' in setup.cfg may affect other parts of the project, especially those using this library.

Finally, there are a few BLACK indicators:

• The removal of raise NotImplementedError in abstract methods from aleph/sdk/client/abstract.py could indicate extensive changes that have a high potential for introducing bugs or require deep understanding of the project architecture.
• Changes in 'eth_abi==4.0.0b2' in setup.cfg may affect other parts of the project, especially those using this library.

Please note that these are just initial assessments based on the provided diff and rules. A more thorough review would be needed to confirm these categorizations.

Here is your response:

## Categorization: BLUE, RED, BLACK
- **BLUE**: Small changes in setup.cfg (aleph-message==0.4.1), no new features or modifications to existing logic identified.
- **RED**: Potential for introducing bugs due to removal of `raise NotImplementedError` from abstract methods, and potential impact on other parts of the project due to changes in 'eth_abi'.
- **BLACK**: Extensive changes that have a high potential for introducing bugs or require deep understanding of the project architecture. Removal of `raise NotImplementedError` from abstract methods and change in 'eth_abi' are considered BLACK indicators. 

I hope this helps you understand the complexity level of your PR. Please let me know if there is anything else I can assist you with.