Merge #3269

3269: Simplify primary key inference r=dureuill a=dureuill

# Pull Request

## Related issue
Related to https://github.com/meilisearch/meilisearch/issues/3233

## What does this PR do?
- Integrates https://github.com/meilisearch/milli/pull/752 in meilisearch
- Remove `Serialize` and `Deserialize` from `error::Code` as it is unused.
- No longer filter on `milli` logs when `--log-level` is "info".
  - `milli` only has the newly-added inference log at the `info` level (from greping `info` in the codebase)
  - the default value for `--log-level` is "INFO" and not "info" since `v0.30` so the filter is not active by default.
- updates milli to v0.38.0

## PR checklist
Please check if your PR fulfills the following requirements:
- [x] Does this PR fix an existing issue, or have you listed the changes applied in the PR description (and why they are needed)?
- [x] Have you read the contributing guidelines?
- [x] Have you made sure that the title is accurate and descriptive of the changes?

Thank you so much for contributing to Meilisearch!


Co-authored-by: Louis Dureuil <louis@meilisearch.com>

meilisearch/src/main.rs

@@ -7,7 +7,6 @@ use actix_web::web::Data;
 use actix_web::HttpServer;
 use index_scheduler::IndexScheduler;
 use meilisearch::analytics::Analytics;
-use meilisearch::option::LogLevel;
 use meilisearch::{analytics, create_app, setup_meilisearch, Opt};
 use meilisearch_auth::{generate_master_key, AuthController, MASTER_KEY_MIN_SIZE};
 
@@ -18,10 +17,6 @@ static ALLOC: mimalloc::MiMalloc = mimalloc::MiMalloc;
 fn setup(opt: &Opt) -> anyhow::Result<()> {
     let mut log_builder = env_logger::Builder::new();
     log_builder.parse_filters(&opt.log_level.to_string());
-    if matches!(opt.log_level, LogLevel::Info) {
-        // if we are in info we only allow the warn log_level for milli
-        log_builder.filter_module("milli", log::LevelFilter::Warn);
-    }
 
     log_builder.init();