Enhance RESTORE with RDBv9 new features

RESTORE now supports:
1. Setting LRU/LFU
2. Absolute-time TTL

Other related changes:
1. RDB loading will not override LRU bits when RDB file
   does not contain the LRU opcode.
2. RDB loading will not set LRU/LFU bits if the server's
   maxmemory-policy does not match.

tests/unit/dump.tcl

@@ -25,6 +25,39 @@ start_server {tags {"dump"}} {
         assert {$ttl >= (2569591501-3000) && $ttl <= 2569591501}
         r get foo
     } {bar}
+    
+    test {RESTORE can set an absolute expire} {
+        r set foo bar
+        set encoded [r dump foo]
+        r del foo
+        set now [clock milliseconds]
+        r restore foo [expr $now+3000] $encoded absttl
+        set ttl [r pttl foo]
+        assert {$ttl >= 2998 && $ttl <= 3000}
+        r get foo
+    } {bar}
+    
+    test {RESTORE can set LRU} {
+        r set foo bar
+        set encoded [r dump foo]
+        r del foo
+        r config set maxmemory-policy allkeys-lru
+        r restore foo 0 $encoded idletime 1000
+        set idle [r object idletime foo]
+        assert {$idle >= 1000 && $idle <= 1002}
+        r get foo
+    } {bar}
+    
+    test {RESTORE can set LFU} {
+        r set foo bar
+        set encoded [r dump foo]
+        r del foo
+        r config set maxmemory-policy allkeys-lfu
+        r restore foo 0 $encoded freq 100
+        set freq [r object freq foo]
+        assert {$freq == 100}
+        r get foo
+    } {bar}
 
     test {RESTORE returns an error of the key already exists} {
         r set foo bar