refactor index schema, remove sidecar parsing, remove TS

src/types.h

@@ -4,7 +4,7 @@
 typedef struct database database_t;
 
 typedef struct index_descriptor {
-    char id[SIST_INDEX_ID_LEN];
+    int id;
     char version[64];
     int version_major;
     int version_minor;
@@ -24,4 +24,11 @@ typedef struct index_t {
     char path[PATH_MAX];
 } index_t;
 
+typedef struct {
+    int doc_id;
+    int index_id;
+    long sid_int64;
+    char sid_str[SIST_SID_LEN];
+} sist_id_t;
+
 #endif