Objective-C interop + a few improvements

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+# Time (`std/time.zc`)
+
+The `std/time` module provides functionality for measuring time and sleeping.
+
+## Usage
+
+```zc
+import "std/time.zc"
+```
+
+## Structs
+
+### Struct `Duration`
+
+Represents a span of time in milliseconds.
+
+#### Methods
+
+- **`fn from_ms(ms: U64) -> Duration`**
+  Creates a duration from milliseconds.
+
+- **`fn from_secs(s: U64) -> Duration`**
+  Creates a duration from seconds.
+
+### Struct `Time`
+
+Utilities for time manipulation.
+
+#### Methods
+
+- **`fn now() -> U64`**
+  Returns the current system time in milliseconds since the epoch.
+
+- **`fn sleep(d: Duration)`**
+  Sleeps for the specified duration.
+
+- **`fn sleep_ms(ms: U64)`**
+  Sleeps for the specified number of milliseconds.