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/Cargo.toml

@@ -2,6 +2,7 @@
 name = "meilisearch-lib"
 version = "0.24.0"
 edition = "2018"
+resolver = "2"
 
 # See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
 
@@ -11,7 +12,6 @@ actix-web-static-files = { git = "https://github.com/MarinPostma/actix-web-stati
 anyhow = { version = "1.0.43", features = ["backtrace"] }
 async-stream = "0.3.2"
 async-trait = "0.1.51"
-arc-swap = "1.3.2"
 byte-unit = { version = "4.0.12", default-features = false, features = ["std"] }
 bytes = "1.1.0"
 chrono = { version = "0.4.19", features = ["serde"] }
@@ -30,7 +30,7 @@ lazy_static = "1.4.0"
 log = "0.4.14"
 meilisearch-error = { path = "../meilisearch-error" }
 meilisearch-tokenizer = { git = "https://github.com/meilisearch/tokenizer.git", tag = "v0.2.5" }
-milli = { git = "https://github.com/meilisearch/milli.git", tag = "v0.20.2" }
+milli = { git = "https://github.com/meilisearch/milli.git", tag = "v0.21.0" }
 mime = "0.3.16"
 num_cpus = "1.13.0"
 once_cell = "1.8.0"
@@ -56,8 +56,13 @@ whoami = { version = "1.1.3", optional = true }
 reqwest = { version = "0.11.4", features = ["json", "rustls-tls"], default-features = false, optional = true }
 sysinfo = "0.20.2"
 derivative = "2.2.0"
+fs_extra = "1.2.0"
 
 [dev-dependencies]
 actix-rt = "2.2.0"
 mockall = "0.10.2"
 paste = "1.0.5"
+nelson = { git = "https://github.com/MarinPostma/nelson.git", rev = "e5f4ff046c21e7e986c7cb31550d1c9e7f0b693b"}
+meilisearch-error = { path = "../meilisearch-error", features = ["test-traits"] }
+proptest = "1.0.0"
+proptest-derive = "0.3.0"