feat(lex_parser, pprocessor): replace consume with next and remove stream resets

- Replace `scc_probe_stream_consume` with `scc_probe_stream_next` for consistent stream advancement
- Remove redundant `scc_probe_stream_reset` calls before peeking, as `next` and `peek` handle state
- Update `scc_cstring_new` to `scc_cstring_create` and `scc_pos_init` to `scc_pos_create` for naming consistency
- Change `scc_pp_macro_get` parameter to `const scc_cstring_t*` for better const-correctness
- Improves code clarity and maintains proper stream position tracking

runtime/libcore/include/core_pos.h

@@ -10,8 +10,8 @@ typedef struct scc_pos {
     usize offset;
 } scc_pos_t;
 
-static inline scc_pos_t scc_pos_init() {
-    return (scc_pos_t){scc_cstring_new(), 1, 1, 0};
+static inline scc_pos_t scc_pos_create() {
+    return (scc_pos_t){scc_cstring_create(), 1, 1, 0};
 }
 
 static inline void scc_pos_next(scc_pos_t *pos) {