refactor, dbwrapper: Add DBParams and DBOptions structs

Add DBParams and DBOptions structs to remove ArgsManager uses from dbwrapper.

To reduce size of this commit, this moves references to gArgs variable out of
dbwrapper.cpp to calling code in txdb.cpp. But these moves are temporary. The
gArgs references in txdb.cpp are moved out to calling code in init.cpp in later
commits.

This commit does not change behavior.

src/index/base.cpp

@@ -8,6 +8,7 @@
 #include <kernel/chain.h>
 #include <node/blockstorage.h>
 #include <node/context.h>
+#include <node/database_args.h>
 #include <node/interface_ui.h>
 #include <shutdown.h>
 #include <tinyformat.h>
@@ -48,7 +49,13 @@ CBlockLocator GetLocator(interfaces::Chain& chain, const uint256& block_hash)
 }
 
 BaseIndex::DB::DB(const fs::path& path, size_t n_cache_size, bool f_memory, bool f_wipe, bool f_obfuscate) :
-    CDBWrapper(path, n_cache_size, f_memory, f_wipe, f_obfuscate)
+    CDBWrapper{DBParams{
+        .path = path,
+        .cache_bytes = n_cache_size,
+        .memory_only = f_memory,
+        .wipe_data = f_wipe,
+        .obfuscate = f_obfuscate,
+        .options = [] { DBOptions options; node::ReadDatabaseArgs(gArgs, options); return options; }()}}
 {}
 
 bool BaseIndex::DB::ReadBestBlock(CBlockLocator& locator) const