[address-resolver] update public OT API for getting cache table (#4599)

This commit updates the public OpenThread APIs to get the address
cache table. The new APIs allows to iterate through all entries
(including in query or retry mode) and provides more info about the
entries, e.g., current timeout, retry delay (if entry is in
query/retry state), or the mesh-local EID, last transaction time (if
entry is in cached state).

src/cli/cli.cpp

@@ -1294,16 +1294,14 @@ void Interpreter::ProcessEidCache(uint8_t aArgsLength, char *aArgs[])
     OT_UNUSED_VARIABLE(aArgsLength);
     OT_UNUSED_VARIABLE(aArgs);
 
-    otEidCacheEntry entry;
+    otCacheEntryIterator iterator;
+    otCacheEntryInfo     entry;
+
+    memset(&iterator, 0, sizeof(iterator));
 
     for (uint8_t i = 0;; i++)
     {
-        SuccessOrExit(otThreadGetEidCacheEntry(mInstance, i, &entry));
-
-        if (!entry.mValid)
-        {
-            continue;
-        }
+        SuccessOrExit(otThreadGetNextCacheEntry(mInstance, &entry, &iterator));
 
         OutputIp6Address(entry.mTarget);
         mServer->OutputFormat(" %04x\r\n", entry.mRloc16);