feat(libs): add cstrlen,wrap_cstr_z

Author: JaDogg

compiler/libs/libs/c.yaka

@@ -222,3 +222,7 @@ def memset(dest: VoidPtr, character: CInt, size: Size) -> VoidPtr:
 @nativedefine("memcmp")
 def memcmp(str1: VoidPtr, str2: VoidPtr, size: Size) -> CInt:
     pass
+
+@nativedefine("strlen")
+def cstrlen(s: CStr) -> Size:
+    pass

compiler/libs/libs/strings/refs.yaka

@@ -1,15 +1,18 @@
 import libs.c
 
-@native("yk__bstr_get_reference")
+@nativedefine("yk__bstr_get_reference")
 def unwrap(a: sr) -> Const[c.CStr]:
     # Get internal string reference from sr
     pass
 
-@native("yk__bstr_c")
+@nativedefine("yk__bstr_c")
 def wrap_cstr(s: c.CStr, length: int) -> sr:
     # Wrap a c.CStr as a sr
     pass
 
+def wrap_cstr_z(s: c.CStr) -> sr:
+    return wrap_cstr(s, cast("int", c.cstrlen(s)))
+
 def wrap(s: sr) -> sr:
     # Wrap a str/literal/sr (if a sr is passed in reference is not wrapped again) as sr
     # This takes advantage of the auto-casting