Add std feature

Author: chipshort

packages/std/Cargo.toml

@@ -12,8 +12,13 @@ readme = "README.md"
 features = ["abort", "stargate", "staking", "cosmwasm_1_4"]
 
 [features]
-default = ["iterator", "abort"]
+default = ["iterator", "abort", "std"]
 abort = []
+# This feature is currently unused, but might be used in the future to replace internal
+# implementation details with no_std compatible ones or feature-gate functionality
+# that is only available in std environments.
+# You probably want to keep this enabled for now to avoid breaking changes later.
+std = []
 # iterator allows us to iterate over all DB items in a given range
 # optional as some merkle stores (like tries) don't support this
 # given Ethereum 1.0, 2.0, Substrate, and other major projects use Tries