refactor some longer functions

internal/endpoints/tokeninfo/history.go

internal/endpoints/tokeninfo/introspect.go

internal/endpoints/tokeninfo/list.go

internal/endpoints/tokeninfo/pkg/tokeninfoHistoryResponse.go

internal/endpoints/tokeninfo/pkg/tokeninfoListResponse.go

internal/endpoints/tokeninfo/pkg/tokeninfoTreeResponse.go

internal/endpoints/tokeninfo/tokeninfo.go

internal/endpoints/tokeninfo/tree.go

shared/mytoken/mytokenHandler.go