feat: track pending payments to MBSM

[shekohex]

Summary of changes
Changes introduced in this pull request:
This pull request introduces several significant changes to the pallets/services module, focusing on enhancing the handling of ERC20 tokens, adding new error types, and implementing mechanisms for staging and refunding service payments. Key changes include modifications to the erc20_transfer function, the addition of new error types, and updates to the storage and event handling logic. Additionally, the pull request includes extensive updates to the testing framework to ensure the correctness of these new features.

Enhancements to ERC20 Token Handling:

• Modified the erc20_transfer function to accept from as an H160 type instead of deriving it from the caller's account ID. This change simplifies the function and improves its flexibility.

New Error Types:

• Added new error types such as MissingEVMOrigin, ExpectedEVMAddress, and ExpectedAccountId to handle specific error scenarios related to EVM addresses and account IDs.

Storage and Event Handling:

• Introduced a new storage map StagingServicePayments to hold service payment information temporarily until the service is initiated or refunded. This ensures accurate tracking and management of service payments.
• Implemented logic to handle the transfer of payments to the Master Blueprint Service Manager (MBSM) upon service initiation and to refund payments to the requester if the service is rejected. [1] [2]

Testing Framework Updates:

• Updated existing tests and added new ones to cover scenarios involving ERC20 token payments, including service requests, approvals, rejections, and refunds. These tests ensure that the new features work as expected and maintain the integrity of the system. [1] [2] [3] [4] [5] [6] [7] [8] [9] [10] [11] [12]

These changes collectively enhance the robustness and functionality of the pallets/services module, particularly in handling ERC20 token transactions and managing service payments.

Reference issue to close (if applicable)

Closes tangle-network/tnt-core#27

[shekohex]

Adding more tests to ensure everything is working.

[1xstj]

LG, just nits