feat: simplify API by using a new approach

include/bel_scan_eng.hrl

@@ -0,0 +1,13 @@
+%% This header exists to be possible to do pattern
+%% matching in modules that behaves as bel_scan_eng.
+
+-record(marker, {
+    id :: bel_scan_mark:id(),
+    re :: bel_scan_mark:re()
+}).
+
+-record(engine, {
+    module  :: module(),
+    markers :: [bel_scan_mark:t()],
+    state   :: bel_scan_eng:state()
+}).

rebar.config

@@ -1,4 +1,4 @@
-{erl_opts, [debug_info, warnings_as_errors]}.
+{erl_opts, [debug_info]}.
 
 {deps, []}.
 
@@ -18,6 +18,9 @@
 ]}.
 
 {profiles, [
+    {prod, [
+        {erl_opts, [no_debug_info, warnings_as_errors]}
+    ]},
     {test, [
         {erl_opts, [{extra_src_dirs, ["test/support"]}]}
     ]}