Leverage github actions for tests and linting.
This includes fixing a bunch of issues highlighted by golangci
including:
* Dead code.
* Ineffectual assigns.
* Goto warnings.
* Nil return err.
* Reused literal strings.
* Test parameter order.
Also:
* Setup clog.
* add benchmarks and tests for native function calls
* improve conversion of various native function parameters
* add support for more types of native function parameters
* improve performance of most parameter types
