Investigate CI testing speed issues

[rwalworth]

Problem

Currently the JS SDK suffers from bad contribution experience as the tests are not optimally implemented or set up.

Solution

• Research and implement parallel test runs in the project Taskfiles - check out this article https://developer.ibm.com/articles/parallel-tests-mocha-v8/
• Reduce mnemonic test iterations as the values are big enough to suffocate the test runs but not big enough for exhaustive testing of the mnemonic features. Could be brought down to 10 times less.

Alternatives

No response