Mono repo -> Master (#22553)

Combines the following repositories into one:

https://github.com/mattermost/mattermost-server
https://github.com/mattermost/mattermost-webapp
https://github.com/mattermost/focalboard
https://github.com/mattermost/mattermost-plugin-playbooks

server/platform/services/cache/cache.go

@@ -0,0 +1,51 @@
+// Copyright (c) 2015-present Mattermost, Inc. All Rights Reserved.
+// See LICENSE.txt for license information.
+
+package cache
+
+import (
+	"errors"
+	"time"
+
+	"github.com/mattermost/mattermost-server/v6/model"
+)
+
+// ErrKeyNotFound is the error when the given key is not found
+var ErrKeyNotFound = errors.New("key not found")
+
+// Cache is a representation of a cache store that aims to replace cache.Cache
+type Cache interface {
+	// Purge is used to completely clear the cache.
+	Purge() error
+
+	// Set adds the given key and value to the store without an expiry. If the key already exists,
+	// it will overwrite the previous value.
+	Set(key string, value any) error
+
+	// SetWithDefaultExpiry adds the given key and value to the store with the default expiry. If
+	// the key already exists, it will overwrite the previous value
+	SetWithDefaultExpiry(key string, value any) error
+
+	// SetWithExpiry adds the given key and value to the cache with the given expiry. If the key
+	// already exists, it will overwrite the previous value
+	SetWithExpiry(key string, value any, ttl time.Duration) error
+
+	// Get the content stored in the cache for the given key, and decode it into the value interface.
+	// Return ErrKeyNotFound if the key is missing from the cache
+	Get(key string, value any) error
+
+	// Remove deletes the value for a given key.
+	Remove(key string) error
+
+	// Keys returns a slice of the keys in the cache.
+	Keys() ([]string, error)
+
+	// Len returns the number of items in the cache.
+	Len() (int, error)
+
+	// GetInvalidateClusterEvent returns the cluster event configured when this cache was created.
+	GetInvalidateClusterEvent() model.ClusterEvent
+
+	// Name returns the name of the cache
+	Name() string
+}