feat(all): Task store

implements:
https://github.com/meilisearch/specifications/blob/develop/text/0060-refashion-updates-apis.md

linked PR:

- #1889
- #1891
- #1892
- #1902
- #1906
- #1911
- #1914
- #1915
- #1916
- #1918
- #1924
- #1925
- #1926
- #1930
- #1936
- #1937
- #1942
- #1944
- #1945
- #1946
- #1947
- #1950
- #1951
- #1957
- #1959
- #1960
- #1961
- #1962
- #1964

- https://github.com/meilisearch/milli/pull/414
- https://github.com/meilisearch/milli/pull/409
- https://github.com/meilisearch/milli/pull/406
- https://github.com/meilisearch/milli/pull/418

- close #1687
- close #1786
- close #1940
- close #1948
- close #1949
- close #1932
- close #1956

meilisearch-lib/src/index_resolver/message.rs

@@ -0,0 +1,37 @@
+use std::{collections::HashSet, path::PathBuf};
+
+use tokio::sync::oneshot;
+use uuid::Uuid;
+
+use crate::index::Index;
+use super::error::Result;
+
+pub enum IndexResolverMsg {
+    Get {
+        uid: String,
+        ret: oneshot::Sender<Result<Index>>,
+    },
+    Delete {
+        uid: String,
+        ret: oneshot::Sender<Result<Index>>,
+    },
+    List {
+        ret: oneshot::Sender<Result<Vec<(String, Index)>>>,
+    },
+    Insert {
+        uuid: Uuid,
+        name: String,
+        ret: oneshot::Sender<Result<()>>,
+    },
+    SnapshotRequest {
+        path: PathBuf,
+        ret: oneshot::Sender<Result<HashSet<Index>>>,
+    },
+    GetSize {
+        ret: oneshot::Sender<Result<u64>>,
+    },
+    DumpRequest {
+        path: PathBuf,
+        ret: oneshot::Sender<Result<HashSet<Index>>>,
+    },
+}