perf(model-client): stricter limit of the body size in pushObjects

The body was previously limit by the number of entries, but some entries are bigger than others.
In some cases the body was too big causing a `413 Request Entity Too Large`.
Now that actual serialized size of the entries is used to split them into chunks.

Author: slisson

model-client/src/commonMain/kotlin/org/modelix/model/client2/ModelClientV2.kt

@@ -347,10 +347,9 @@ class ModelClientV2(
             val entrySize = (if (chunkContent.isEmpty()) 0 else 1) + entry.first.length + 1 + entry.second.length
             if (chunkContent.length + entrySize > maxBodySize) {
                 sendChunk()
-            } else {
-                if (chunkContent.isNotEmpty()) chunkContent.append('\n')
-                chunkContent.append(entry.first).append('\n').append(entry.second)
             }
+            if (chunkContent.isNotEmpty()) chunkContent.append('\n')
+            chunkContent.append(entry.first).append('\n').append(entry.second)
         }
         if (chunkContent.isNotEmpty()) sendChunk()
     }