Make SharedTrieCache/LocalTrieCache work with entire state in memory

[alexggh]

Trie cache(SharedTrieCache and LocalTrieCache) needs to be extended and fixed to work with the assumption that the entire state will find its way into the SharedTrieCache. For that we need to:

• Improve the LocalTrieCache, to get rid of all the hardcodings regarding its size.
• Find a solution to safely allow it to write-back everything back SharedTrieCache(Currently, this is done on Drop and it is limited to a fixed number of keys)