Move crates under a sub folder to clean up the code

Cargo.toml

@@ -1,24 +1,24 @@
 [workspace]
 resolver = "2"
 members = [
-    "meilisearch",
-    "meilitool",
-    "meilisearch-types",
-    "meilisearch-auth",
-    "meili-snap",
-    "index-scheduler",
-    "dump",
-    "file-store",
-    "permissive-json-pointer",
-    "milli",
-    "filter-parser",
-    "flatten-serde-json",
-    "json-depth-checker",
-    "benchmarks",
-    "fuzzers",
-    "tracing-trace",
-    "xtask",
-    "build-info",
+    "crates/meilisearch",
+    "crates/meilitool",
+    "crates/meilisearch-types",
+    "crates/meilisearch-auth",
+    "crates/meili-snap",
+    "crates/index-scheduler",
+    "crates/dump",
+    "crates/file-store",
+    "crates/permissive-json-pointer",
+    "crates/milli",
+    "crates/filter-parser",
+    "crates/flatten-serde-json",
+    "crates/json-depth-checker",
+    "crates/benchmarks",
+    "crates/fuzzers",
+    "crates/tracing-trace",
+    "crates/xtask",
+    "crates/build-info",
 ]
 
 [workspace.package]