warn when reading large amount of data from inputstream into memory

During SLING-11468 we found a situation in the JcrPropertyMapCacheEntry where data is read from an input stream into memory and stored within a String.
The size of data to be read is unbound and it can cause a memory problem. For this reason we should implement log warnings, when more than 100k/1M/10M/100M bytes are read from this input stream.