Address npm install warnings and recommnedations

[AlfredoG87]

Problem

When doing a fresh npm install after cloning the project the process highlights some WARNINGS and recommendations that the mainteners of the relay should address in a timely manner. and before this becomes an issue:

Currently there are some messages that should be reviewed and addressed.

Solution

Address the following:

• npm WARN deprecated har-validator@5.1.5: this library is no longer supported
• npm WARN deprecated koa-router@10.1.1: IMPORTANT 10x+ PERFORMANCE UPGRADE: Please upgrade to v12.0.1+ as we have fixed an issue with debuglog causing 10x slower router benchmark performance, see fix: revert conversion of 'debug' package for 'node:util::debuglog' koajs/router#173
• npm WARN deprecated testrpc@0.0.1: testrpc has been renamed to ganache-cli, please use this package from now on.
• npm WARN deprecated argv@0.0.2: Package no longer supported. Contact Support at https://www.npmjs.com/support for more info.
• npm WARN deprecated uuid@3.4.0: Please upgrade to version 7 or higher. Older versions may use Math.random() in certain circumstances, which is known to be problematic. See https://v8.dev/blog/math-random for details.
• npm WARN deprecated request@2.88.2: request has been deprecated, see Request’s Past, Present and Future request/request#3142
• npm WARN deprecated codecov@3.8.3: https://about.codecov.io/blog/codecov-uploader-deprecation-plan/
• npm WARN deprecated sinon@14.0.2: 16.1.1
• npm WARN deprecated @ensdomains/ens@0.4.5: Please use @ensdomains/ens-contracts
• npm WARN deprecated @ensdomains/resolver@0.2.4: Please use @ensdomains/ens-contracts

Alternatives

No response

[AlfredoG87]

The second koa-router@10.1.1: IMPORTANT 10x+ PERFORMANCE UPGRADE: has been addressed already on PR:
#2067