feat: test for fetching certificate from target subnet

[JDawg287]

Description

This PR adds test scripts to fetch a certificate from the target subnet once it has been delivered to the TCE network and then included on the target subnet.

Fixes TP-816

Additions and Changes

• Added send-token.ts script to send tokens to a subnet
• Added get-certificate.ts script to fetch a certificate from a subnet
• Added a test_cert_inclusion.sh script to test if the certificate is included on the subnet
• Added a copy_contracts_artifacts.sh script to copy the JSON ABI of the smart contracts to the host machine before running the tests
• Modified the .env file to expose the INCAL_HOST_PORT to the bash scripts

PR Checklist:

• I have performed a self-review of my code
• I have commented on my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• I have added or updated tests that comprehensively prove my change is effective or that my feature works