implement client to call rpc endpoint

[ryoppippi]

instead of using typscript-client, implement it by ourselves in this repo.
also, add test as well

[ryoppippi]

rpc documents are here
https://docs.stackone.com/platform/api-reference/actions/make-an-rpc-call-to-an-action
https://docs.stackone.com/platform/api-reference/actions/list-all-actions-metadata

[ryoppippi]

so remove typescript-client-sdk and replace them.
also we need write test