refactor: Convert ChainstateRole enum to struct

Change ChainstateRole parameter passed to wallets and indexes. Wallets and
indexes need to know whether chainstate is historical and whether it is fully
validated. They should not be aware of the assumeutxo snapshot validation
process.

src/node/blockstorage.cpp

@@ -12,9 +12,11 @@
 #include <flatfile.h>
 #include <hash.h>
 #include <kernel/blockmanager_opts.h>
+#include <kernel/chain.h>
 #include <kernel/chainparams.h>
 #include <kernel/messagestartchars.h>
 #include <kernel/notifications_interface.h>
+#include <kernel/types.h>
 #include <logging.h>
 #include <pow.h>
 #include <primitives/block.h>