Add librdb tool and c-library (#2675)

Co-authored-by: moticless <[email protected]>

Author: moticless

libraries/c/github.com/redis/librdb.json

@@ -0,0 +1,5 @@
+{
+  "name": "librdb",
+  "description": "Redis RDB file parser, with JSON, RESP and RDB-loader extensions",
+  "recommended": true
+}

tools/other/github.com/redis/librdb.json

@@ -0,0 +1,5 @@
+{
+  "name": "librdb",
+  "description": "Redis RDB file parser, with JSON, RESP and RDB-loader extensions",
+  "recommended": true
+}