refactor endpoint handlers

go.mod

go.sum

internal/config/config_test.go

internal/db/db_test.go

internal/endpoints/configuration/configurationEndpoint.go

internal/endpoints/configuration/pkg/mytokenConfiguration.go

internal/endpoints/redirect/redirectEndpoint.go

internal/endpoints/token/super/supertokenEndpoint.go

internal/model/apiError.go

internal/oidc/authcode/authcode.go