enhanced readibility, fixed spelling mistakes and normalized code structuring

[amstrdm]

Ended up adding all new endpoints to the client. See commits for details but the two main endpoint sections I added are

• Pie Endpoints
• History Exports Endpoints

Specifically:

Pie Endpoints:

1. Get All Pies:

   • Endpoint: GET https://live.trading212.com/api/v0/equity/pies
   • Description: Retrieves a list of all pies in your account.

2. Create a New Pie:

   • Endpoint: POST https://live.trading212.com/api/v0/equity/pies
   • Description: Creates a new pie with specified instruments and allocations.

3. Delete a Pie:

   • Endpoint: DELETE https://live.trading212.com/api/v0/equity/pies/{id}
   • Description: Deletes a pie by its ID.

4. Get a Specific Pie:

   • Endpoint: GET https://live.trading212.com/api/v0/equity/pies/{id}
   • Description: Retrieves details of a specific pie by its ID.

5. Update a Pie:

   • Endpoint: POST https://live.trading212.com/api/v0/equity/pies/{id}
   • Description: Updates an existing pie with new allocations or instruments.

History Exports Endpoints:

1. Get Exported History Files:

   • Endpoint: GET https://live.trading212.com/api/v0/history/exports
   • Description: Retrieves a list of all previously exported history files.

2. Request a New History Export:

   • Endpoint: POST https://live.trading212.com/api/v0/history/exports
   • Description: Initiates a new export of your transaction history.

[ms32035]

@amstrdm first of all thank you for the contribution. In order for me to accept it, you'd need to make a few changes:

1. please remove the validation functions. Validations should be left to the API and the package currently correctly raises errors from the API. In particular, hard-coding a long list of strings that's likely to change like the icons isn't the best practice.
2. Your code is failing pre-commit hooks. For your convenience I've updated these to the latest versions in main so you can rebase.