Refactor VM root modules

This `st_table` is used to both mark and pin classes
defined from the C API. But `vm->mark_object_ary` already
does both much more efficiently.

Currently a Ruby process starts with 252 rooted classes,
which uses `7224B` in an `st_table` or `2016B` in an `RArray`.

So a baseline of 5kB saved, but since `mark_object_ary` is
preallocated with `1024` slots but only use `405` of them,
it's a net `7kB` save.

`vm->mark_object_ary` is also being refactored.

Prior to this changes, `mark_object_ary` was a regular `RArray`, but
since this allows for references to be moved, it was marked a second
time from `rb_vm_mark()` to pin these objects.

This has the detrimental effect of marking these references on every
minors even though it's a mostly append only list.

But using a custom TypedData we can save from having to mark
all the references on minor GC runs.

Addtionally, immediate values are now ignored and not appended
to `vm->mark_object_ary` as it's just wasted space.

numeric.c

@@ -6262,7 +6262,7 @@ Init_Numeric(void)
     rb_fix_to_s_static[8] = rb_fstring_literal("8");
     rb_fix_to_s_static[9] = rb_fstring_literal("9");
     for(int i = 0; i < 10; i++) {
-        rb_gc_register_mark_object(rb_fix_to_s_static[i]);
+        rb_vm_register_global_object(rb_fix_to_s_static[i]);
     }
 
     rb_cFloat  = rb_define_class("Float", rb_cNumeric);