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>

store/noop.go

@@ -0,0 +1,31 @@
+package store
+
+type noopStore struct{}
+
+func (n *noopStore) Init(opts ...Option) error {
+	return nil
+}
+
+func (n *noopStore) Options() Options {
+	return Options{}
+}
+
+func (n *noopStore) String() string {
+	return "noop"
+}
+
+func (n *noopStore) Read(key string, opts ...ReadOption) ([]*Record, error) {
+	return []*Record{}, nil
+}
+
+func (n *noopStore) Write(r *Record, opts ...WriteOption) error {
+	return nil
+}
+
+func (n *noopStore) Delete(key string, opts ...DeleteOption) error {
+	return nil
+}
+
+func (n *noopStore) List(opts ...ListOption) ([]string, error) {
+	return []string{}, nil
+}