Improve build and test speed

Test speed has been improved only slightly by tweaking a 2-second running tests.

Build has been improved by:
1 - moving logFunctionCallError out of js.Caller and to a standalone function
2 - removing some non-generic code from the generic portions of the logger

Caller.getter and Caller.setter have been removed in favor or calling
Caller.method. This wasn't previously possible - prior to our v8 upgrade, they
had different signatures.

Also removed a largely unused parser/str.zig file.

src/http/client.zig

@@ -3170,7 +3170,7 @@ test "HttpClient: async tls no body" {
     }
 }
 
-test "HttpClient: async tls with body x" {
+test "HttpClient: async tls with body" {
     defer testing.reset();
     for (0..5) |_| {
         var client = try testClient();