feat+fix: make compiler STRONGAAA

- FEAT: add source code length field in `fzl_reader_t` struct
- FIX: check name, lpair (lparen) and rpair (rparen) when lexing call
- FIX: check string literal termination
- FIX: increment position even on empty string to prevent infinite
lexing loop
- FIX: add string terminator in `fzl_mktoken` when allocating space for
string value
- FIX: add check for errors in recursevly called `walk`
- FIX: change source code holder from stack-stored `char[8192]` to
dynamically allocated with actual file size holder
- FIX: correct constant hasing util to hash actual string value instead
of link

src/compiler/utils/fzl_const_pool.c

@@ -33,7 +33,7 @@ static uint32_t fzl_hash_const(fzl_const_t c)
   switch (c.type)
   {
   case FZL_CONSTTYPE_STRING:
-    data = (const uint8_t *)&c.as.string.chars;
+    data = (const uint8_t *)c.as.string.chars;
     size = c.as.string.length;
     break;
   }