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/src/stream.c

@@ -164,8 +164,8 @@ static void scc_owned_mem_stream_drop(scc_probe_stream_t *_stream) {
     scc_free(stream);
 }
 
-scc_probe_stream_t *scc_mem_probe_stream_new(const char *data, usize length,
-                                             cbool owned) {
+scc_probe_stream_t *scc_mem_probe_stream_alloc(const char *data, usize length,
+                                               cbool owned) {
     scc_mem_probe_stream_t *stream =
         (scc_mem_probe_stream_t *)scc_malloc(sizeof(scc_mem_probe_stream_t));
     if (stream == null) {