feat: regex for keywords, expect() to function as a parser

examples/print._tmp.sr

@@ -0,0 +1,25 @@
+// import somefoo
+//thisissomefoo
+main() {
+     uint1 y = 1;
+     uint8 x = 0;
+     if x > 0 {
+     	print("Hello World, x is zero");
+     } else {
+     	print("Hello World, x is %", x);
+     }
+
+     while x < 10 {
+     	   x++;
+     }
+     print("x is % now", x);
+
+     string file_path = "../examples/print.sr";
+     fs.read(file_path);
+
+
+     uint8[] x = [1,2,3];
+     x.push(4);
+     x.push(1);
+     x.push(2);
+}

examples/print.sr

@@ -1,5 +1,7 @@
+use foo;
+// comment
 main() {
-     uint32 y = 1;
+     uint y = 1;
      uint8 x = 0;
      if x > 0 {
      	print("Hello World, x is zero");