Transfer fees and node fetch

[ToJen]

Description

Please include a summary of the changes and the related issue. Please also include relevant motivation and context. List any dependencies that are required for this change.

This change:

• replaces node-fetch with cross-fetch to enable the SDK to be used in both the browser and server-side. This has already worked with our mexa-sdk.
• adds a new method to the DepositManager class called getTransferFee which calls our Transfer Fee API thereby providing the functionality within the SDK and replaces the need to call the now deprecated LiquidityPoolManager.adminFee smart contract function.
• refactors the tag field to dAppName in the deposit function.

Type of change

Please delete options that are not relevant.

• [X] Bug fix (non-breaking change which fixes an issue)
• [X] New feature (non-breaking change which adds functionality)
• [ ] Breaking change (fix or feature that would cause existing functionality to not work as expected)
• [X] This change requires a documentation update

How Has This Been Tested?

Please describe the tests that you ran to verify your changes. Provide instructions so we can reproduce. Please also list any relevant details for your test configuration

• [X] Manual Testing
  • Tested Hyphen-UI locally using by pointing its Hyphen-SDK dependency to my local changes. Performed a few transfers and they worked .
  • Sample txns:
  • 123 USDT from Goerli to Mumbai.
  • 321 USDT from Mumbai to Goerli.
• [X] Automated Testing
  • Added both unit and e2e tests for the getTransferFee functionality

Test Configuration:

Nothing special yet but note that for e2e tests, a .env file has to be created based on the .env.example template file under test/e2e/.

Steps to reproduce

• Pull my branch with these steps.
• Run yarn to install the new dependencies.
• Run yarn dev.
• Run yarn test:unit to run unit tests alone (with coverage).
• Run yarn e2e to run e2e tests alone.
• Run yarn test to run the full test suite.

Automated Tests Added/Updated

• [X] E2E Tests
  • Added both a success and negative test
  • Moved the e2e/ folder under a new test/ folder containing
• [X] Unit Tests
  • Added new unit tests in the test/unit folder which has a similar folder structure as the src folder.

Coverage

Based on unit tests only:

Checklist:

• [ ] My code follows the style guidelines of this project
• [X] I have performed a self-review of my code
• [X] I have commented my code, particularly in hard-to-understand areas
• [X] I have made corresponding changes to the documentation
• [X] My changes generate no new warnings
• [X] I have added tests that prove my fix is effective or that my feature works
• [X] New and existing unit tests pass locally with my changes
• [ ] Any dependent changes have been merged and published in downstream modules