Introduce 'time' feature in lightning-liquidity.

This will be used to allow disabling time-dependent functionality.
'time' is included in the features default.

Author: martinsaposnic

lightning-liquidity/Cargo.toml

@@ -14,8 +14,9 @@ categories = ["cryptography::cryptocurrencies"]
 # See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
 
 [features]
-default = ["std"]
+default = ["std", "time"]
 std = ["lightning/std"]
+time = ["std"]
 backtrace = ["dep:backtrace"]
 
 [dependencies]