[MM-44488] Cloud limits: enforcing messages (#20362)

* Add new Job to keep updating the last_accessible_post time

* Filter out posts for funcs returning PostList model

* Separate methods to get and compute cache

* filter pinned posts

* For posts with sorted CreateAt order, support a faster form of filtering.

* Add inaccessible header for getPost and getPostsByIDs APIs

* replace manual binary search with the std. library

* in-place filter posts

Co-authored-by: Mattermod <mattermod@users.noreply.github.com>
Co-authored-by: Nathaniel Allred <neallred@protonmail.com>

model/client4.go

@@ -18,29 +18,30 @@ import (
 )
 
 const (
-	HeaderRequestId          = "X-Request-ID"
-	HeaderVersionId          = "X-Version-ID"
-	HeaderClusterId          = "X-Cluster-ID"
-	HeaderEtagServer         = "ETag"
-	HeaderEtagClient         = "If-None-Match"
-	HeaderForwarded          = "X-Forwarded-For"
-	HeaderRealIP             = "X-Real-IP"
-	HeaderForwardedProto     = "X-Forwarded-Proto"
-	HeaderToken              = "token"
-	HeaderCsrfToken          = "X-CSRF-Token"
-	HeaderBearer             = "BEARER"
-	HeaderAuth               = "Authorization"
-	HeaderCloudToken         = "X-Cloud-Token"
-	HeaderRemoteclusterToken = "X-RemoteCluster-Token"
-	HeaderRemoteclusterId    = "X-RemoteCluster-Id"
-	HeaderRequestedWith      = "X-Requested-With"
-	HeaderRequestedWithXML   = "XMLHttpRequest"
-	HeaderRange              = "Range"
-	STATUS                   = "status"
-	StatusOk                 = "OK"
-	StatusFail               = "FAIL"
-	StatusUnhealthy          = "UNHEALTHY"
-	StatusRemove             = "REMOVE"
+	HeaderRequestId            = "X-Request-ID"
+	HeaderVersionId            = "X-Version-ID"
+	HeaderClusterId            = "X-Cluster-ID"
+	HeaderEtagServer           = "ETag"
+	HeaderEtagClient           = "If-None-Match"
+	HeaderForwarded            = "X-Forwarded-For"
+	HeaderRealIP               = "X-Real-IP"
+	HeaderForwardedProto       = "X-Forwarded-Proto"
+	HeaderToken                = "token"
+	HeaderCsrfToken            = "X-CSRF-Token"
+	HeaderBearer               = "BEARER"
+	HeaderAuth                 = "Authorization"
+	HeaderCloudToken           = "X-Cloud-Token"
+	HeaderRemoteclusterToken   = "X-RemoteCluster-Token"
+	HeaderRemoteclusterId      = "X-RemoteCluster-Id"
+	HeaderRequestedWith        = "X-Requested-With"
+	HeaderRequestedWithXML     = "XMLHttpRequest"
+	HeaderHasInaccessiblePosts = "Has-Inaccessible-Posts"
+	HeaderRange                = "Range"
+	STATUS                     = "status"
+	StatusOk                   = "OK"
+	StatusFail                 = "FAIL"
+	StatusUnhealthy            = "UNHEALTHY"
+	StatusRemove               = "REMOVE"
 
 	ClientDir = "client"