wip: working on analyzer

- Feat: add `nest_ctx` and `fin_ctx` fns for working with context and
environment
- Feat: add block analyzer
- Feat: add conditional statement analyzer

src/compiler/analyzer/an_identifier.c

@@ -13,8 +13,7 @@ fzl_an_res_t analyze_identifier(fzl_analyzer_t *analyzer, fzl_node_t *id)
 
   if (!id || id->type != FZL_NODETYPE_IDENTIFIER)
   {
-    snprintf(id_problem, sizeof(id_problem), "cannot parse identifier");
-    an_push_error(analyzer, NULL, id_problem);
+    an_push_error(analyzer, NULL, "provided node is not typeof IDENTIFIER");
     return (fzl_an_res_t){.error = true};
   }