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/document_formats.rs

@@ -58,7 +58,7 @@ impl ErrorCode for DocumentFormatError {
 internal_error!(DocumentFormatError: io::Error);
 
 /// reads csv from input and write an obkv batch to writer.
-pub fn read_csv(input: impl Read, writer: impl Write + Seek) -> Result<()> {
+pub fn read_csv(input: impl Read, writer: impl Write + Seek) -> Result<usize> {
     let writer = BufWriter::new(writer);
     let builder =
         DocumentBatchBuilder::from_csv(input, writer).map_err(|e| (PayloadType::Csv, e))?;
@@ -67,13 +67,13 @@ pub fn read_csv(input: impl Read, writer: impl Write + Seek) -> Result<()> {
         return Err(DocumentFormatError::EmptyPayload(PayloadType::Csv));
     }
 
-    builder.finish().map_err(|e| (PayloadType::Csv, e))?;
+    let count = builder.finish().map_err(|e| (PayloadType::Csv, e))?;
 
-    Ok(())
+    Ok(count)
 }
 
 /// reads jsonl from input and write an obkv batch to writer.
-pub fn read_ndjson(input: impl Read, writer: impl Write + Seek) -> Result<()> {
+pub fn read_ndjson(input: impl Read, writer: impl Write + Seek) -> Result<usize> {
     let mut reader = BufReader::new(input);
     let writer = BufWriter::new(writer);
 
@@ -91,13 +91,13 @@ pub fn read_ndjson(input: impl Read, writer: impl Write + Seek) -> Result<()> {
         return Err(DocumentFormatError::EmptyPayload(PayloadType::Ndjson));
     }
 
-    builder.finish().map_err(|e| (PayloadType::Ndjson, e))?;
+    let count = builder.finish().map_err(|e| (PayloadType::Ndjson, e))?;
 
-    Ok(())
+    Ok(count)
 }
 
 /// reads json from input and write an obkv batch to writer.
-pub fn read_json(input: impl Read, writer: impl Write + Seek) -> Result<()> {
+pub fn read_json(input: impl Read, writer: impl Write + Seek) -> Result<usize> {
     let writer = BufWriter::new(writer);
     let mut builder = DocumentBatchBuilder::new(writer).map_err(|e| (PayloadType::Json, e))?;
     builder
@@ -108,7 +108,7 @@ pub fn read_json(input: impl Read, writer: impl Write + Seek) -> Result<()> {
         return Err(DocumentFormatError::EmptyPayload(PayloadType::Json));
     }
 
-    builder.finish().map_err(|e| (PayloadType::Json, e))?;
+    let count = builder.finish().map_err(|e| (PayloadType::Json, e))?;
 
-    Ok(())
+    Ok(count)
 }