Soroswap liquidity providers

[Benjtalkshow]

Closes #37

This pull request introduces the following changes to the providers module:

• Added error handling for provider data validation in providers/events.rs to ensure that liquidity and total supply values are valid.
• Implemented the validate_provider_data function to check for negative liquidity and non-positive total supply values.
• Added functions get_provider_from_mint and get_provider_from_burn to process mint and burn events, respectively.
  These functions validate the event data, calculate the share percentage, and create a ProvidersTable entry.
  The handle_contract_events function processes a list of contract events and logs them to the ProvidersTable.

Data Structures:

• Defined MintEvent and BurnEvent structs in providers/types.rs to represent the data structure of mint and burn events.
• Defined the ProvidersTable struct to store provider data, including the provider address, pool address, shares, share percentage, token amounts, timestamp, action, and transaction hash.

Module Structure:

• Updated providers/mod.rs to include the events and types modules.

Testing:

Added unit tests for get_provider_from_mint and get_provider_from_burn to ensure the functions handle valid and invalid data correctly.

@esteblock Please review

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