Merge #1793

1793: Remove memmap dependency r=curquiza a=palfrey

Fixes #1792. I was going to replace with [memmap2](https://github.com/RazrFalcon/memmap2-rs) which should be a drop-in replacement, but I couldn't actually find anything that actually directly used it. It ends up being a dependency in [milli](https://github.com/meilisearch/milli) so I'm going to go there next and fix that.

Co-authored-by: Tom Parker-Shemilt <palfrey@tevp.net>

Cargo.lock

@@ -1619,7 +1619,6 @@ dependencies = [
  "meilisearch-error",
  "meilisearch-lib",
  "meilisearch-tokenizer",
- "memmap",
  "mime",
  "num_cpus",
  "obkv",
@@ -1685,7 +1684,6 @@ dependencies = [
  "log",
  "meilisearch-error",
  "meilisearch-tokenizer",
- "memmap",
  "milli",
  "mime",
  "num_cpus",

meilisearch-http/Cargo.toml

@@ -47,7 +47,6 @@ log = "0.4.14"
 meilisearch-lib = { path = "../meilisearch-lib" }
 meilisearch-error = { path = "../meilisearch-error" }
 meilisearch-tokenizer = { git = "https://github.com/meilisearch/tokenizer.git", tag = "v0.2.5" }
-memmap = "0.7.0"
 mime = "0.3.16"
 num_cpus = "1.13.0"
 once_cell = "1.8.0"

meilisearch-lib/Cargo.toml

@@ -30,7 +30,6 @@ 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" }
-memmap = "0.7.0"
 milli = { git = "https://github.com/meilisearch/milli.git", tag = "v0.17.0"}
 mime = "0.3.16"
 num_cpus = "1.13.0"