Rewrite the store interface (#1335)

* WIP store rewrite

* Fix memory store tests

* Store hard expiry times rather than duration!

* Clarify memory test

* Add limit to store interface

* Implement suffix option

* Don't return nils from noop store

* Fix syncmap

* Start fixing store service

* wip service and cache

* Use _ for special characters in cockroachdb namespace

* Improve cockroach namespace comment

* Use service name as default store namespace

* Fixes

* Implement Store Scope

* Start fixing etcd

* implement read and write with expiry and prefix

* Fix etcd tests

* Fix cockroach store

* Fix cloudflare interface

* Fix certmagic / cloudflare store

* comment lint

* cache isn't implemented yet

* Only prepare DB staements once

Co-authored-by: Ben Toogood <ben@micro.mu>
Co-authored-by: ben-toogood <bentoogood@gmail.com>

sync/map.go

@@ -90,7 +90,7 @@ func (m *syncMap) Delete(key interface{}) error {
 }
 
 func (m *syncMap) Iterate(fn func(key, val interface{}) error) error {
-	keyvals, err := m.opts.Store.List()
+	keyvals, err := m.opts.Store.Read("", store.ReadPrefix())
 	if err != nil {
 		return err
 	}