ci: circleci -> github actions

[alessio]

Please migrate CI pipelines from CircleCI to Github Actions.

[alessio]

CC'ing @helder-moreira for visibility

[helder-moreira]

@alessio you mean all CI pipelines right? If so, please re-open this.

[tac0turtle]

Not sure what images from this repo are used in the sdk but for tendermint repos I removed the need for them here. If the sdk doesn't have any dependence here we can remove circleci right not