Imported sled database interface from JetRPC

- Builtin erc20 abi used Ethereum Binance Pegged Contract.
- Wrapper struct for erc20 token
- get_balance for erc20 token
- refactored sled db interface
- set gateway callback function to be async
- drafted poller function (untested)
- invoice struct

todo: test the poller by using this as external library and also draft test cases to test the poller to the extent possible without involving private keys into the repo

- changed project structure to prevent internal interfaces from being exported to the public API.
- added custom expiration for invoices
- added descriptive names for payment gateways

Refactored according to suggestions by clippy.

Added description of how the library functions

- Deprecated rust-web3 in favor of alloy-rs due to rust-web3 being deprecated in the future
- Replaced eth abi with IERC20 abi.
- Transfer paid invoice funds to treasury when paid

TODO: in the near future token transfers also need to be included so that it is possible to configure payments via tokens.

Add basic rust pipeline

- use RUST_LOG
- simplify functions
- convert sled errors to custom db error
- deprecate audit module
- reduce cloning and replace with ref usage
- add zeroize type for wallet bytes

…xless

feat: make callback structure mutexless

Co-Authored-By: Maxim <[email protected]>