restructure + client POC

.gitignore

cmd/mytoken/client/main.go

internal/client/config/config.go

internal/server/config/config.go

...brepo/supertokenrepo/transfercoderepo/pollingCodeTmpST.go

...db/dbrepo/supertokenrepo/transfercoderepo/transfercode.go

...erver/endpoints/configuration/pkg/mytokenConfiguration.go

...l/server/endpoints/token/access/pkg/accessTokenRequest.go

internal/server/model/response.go

pkg/model/apiError.go

pkg/model/grantType.go

pkg/model/oidcFlow.go

pkg/model/responseType.go

pkg/mytokenlib/accesstoken.go

pkg/mytokenlib/error.go

pkg/mytokenlib/mytoken.go

pkg/mytokenlib/supertoken.go