Portal Spec Test Runner

[acolytec3]

This adds a new test script for running the portal-spec-test test vectors, currently hardcoded to run the hive test vectors.

Since these tests are simple content key -> content value vectors, this can easily be expanded to run any of the spec tests by simply reading in all the yaml files from the portal-spec-test package and then attempting to store them with the appropriate network class.

TODO:

• Expand the logic to read all subdirectories of the portal-spec-test repo and then parse each yaml file and try to decode its content keys and values
• Add network specific test execution functions based on the test metadata
  • Take the existing store code snippet and make it specific for History network tests.
  • Parse test metadata (e.g. directory names, test comments, etc) to determine which network to use
• Add appropriate setup and teardown logic to load each file individually (to ensure we don't have OOM issues)

[ScottyPoi]

We should use this to replace all tests like https://github.com/ethereumjs/ultralight/blob/446a66cae81bd6d287efc71a2cc81b74cb301b51/packages/portalnetwork/test/wire/types.spec.ts where we have the test vectors hardcoded.