Accumulated changes for message queue (#6600)

* rename

* set agent address

* refactor

* add agent sub

* pub messages

* grpc new client

* can publish records via agent

* send init message with session id

* fmt

* check cancelled request while waiting

* use sessionId

* handle possible nil stream

* subscriber process messages

* separate debug port

* use atomic int64

* less logs

* minor

* skip io.EOF

* rename

* remove unused

* use saved offsets

* do not reuse session, since always session id is new after restart

remove last active ts from SessionEntry

* simplify printing

* purge unused

* just proxy the subscription, skipping the session step

* adjust offset types

* subscribe offset type and possible value

* start after the known tsns

* avoid wrongly set startPosition

* move

* remove

* refactor

* typo

* fix

* fix changed path

weed/pb/mq_schema.proto

@@ -24,17 +24,17 @@ message Offset {
     repeated PartitionOffset partition_offsets = 2;
 }
 
-enum PartitionOffsetStartType {
-    EARLIEST = 0;
-    EARLIEST_IN_MEMORY = 1;
-    LATEST = 2;
+enum OffsetType {
+    RESUME_OR_EARLIEST = 0;
+    RESET_TO_EARLIEST = 5;
+    EXACT_TS_NS = 10;
+    RESET_TO_LATEST = 15;
+    RESUME_OR_LATEST = 20;
 }
 
 message PartitionOffset {
     Partition partition = 1;
     int64 start_ts_ns = 2;
-    int64 stop_ts_ns = 3;
-    PartitionOffsetStartType start_type = 4;
 }
 
 ///////////////////////////