ci: migrate from circleci to github actions (#20)

* ci: add test-golang workflow

* ci: delete circleci yml file

This was used by op, we are moving to using github actions for our fork

* ci: fix linter by using golangci-lint action

* ci: use golangci-lint v1.61 to match mise.toml requirement

* ci: use mise in ci to install correct versions of dependencies

* ci: remove setup-go step because go already installed by mise in previous step

* ci: build contracts that are needed for op-e2e tests

* ci: use caching for forge artifacts

* ci: remove slow op-program build

don't think we are using it... testing

* ci: make go-lint job run in parallel, and update version to try to fix errors

* ci: add go modules caching to speed up workflow

* ci: add explicit go mod download

Author: samlaf