feat!: download file to fill the cache on write cache miss (#7294)

* feat: download inverted index file

Signed-off-by: evenyag <realevenyag@gmail.com>

* feat: download for bloom and fulltext

Signed-off-by: evenyag <realevenyag@gmail.com>

* feat: implement maybe_download_background for FileCache

Signed-off-by: evenyag <realevenyag@gmail.com>

* feat: load file for parquet

Signed-off-by: evenyag <realevenyag@gmail.com>

* chore: reduce channel size

Signed-off-by: evenyag <realevenyag@gmail.com>

* feat: use ManifestCache

Signed-off-by: evenyag <realevenyag@gmail.com>

* refactor: pass cache to ManifestObjectStore::new

Signed-off-by: evenyag <realevenyag@gmail.com>

* style: fix fmt and clippy

Signed-off-by: evenyag <realevenyag@gmail.com>

* chore: remove manifest cache ttl

Signed-off-by: evenyag <realevenyag@gmail.com>

* refactor: remove read cache

Signed-off-by: evenyag <realevenyag@gmail.com>

* feat: clean old read cache path

Signed-off-by: evenyag <realevenyag@gmail.com>

* docs: update config

Signed-off-by: evenyag <realevenyag@gmail.com>

* docs: update config examples

Signed-off-by: evenyag <realevenyag@gmail.com>

* test: update test

Signed-off-by: evenyag <realevenyag@gmail.com>

* chore: fix CI

Signed-off-by: evenyag <realevenyag@gmail.com>

* fix: also clean the root directory

Signed-off-by: evenyag <realevenyag@gmail.com>

* test: update manifest test

Signed-off-by: evenyag <realevenyag@gmail.com>

* chore: fix compiler errors

Signed-off-by: evenyag <realevenyag@gmail.com>

* feat: skip file if it exists

Signed-off-by: evenyag <realevenyag@gmail.com>

* feat: remove warn in replace

Signed-off-by: evenyag <realevenyag@gmail.com>

* feat: add a flag to enable/disable background download

set the concurrency to 1 for background download

Signed-off-by: evenyag <realevenyag@gmail.com>

* refactor: rename write_cache_enable_background_download to enable_refill_cache_on_read

Signed-off-by: evenyag <realevenyag@gmail.com>

* test: update config test

Signed-off-by: evenyag <realevenyag@gmail.com>

* chore: address comments

Signed-off-by: evenyag <realevenyag@gmail.com>

* docs: update config.md

Signed-off-by: evenyag <realevenyag@gmail.com>

* chore: fmt code

Signed-off-by: evenyag <realevenyag@gmail.com>

---------

Signed-off-by: evenyag <realevenyag@gmail.com>

tests-integration/tests/http.rs

@@ -1503,6 +1503,8 @@ write_cache_path = ""
 write_cache_size = "5GiB"
 preload_index_cache = true
 index_cache_percent = 20
+enable_refill_cache_on_read = true
+manifest_cache_size = "256MiB"
 sst_write_buffer_size = "8MiB"
 parallel_scan_channel_size = 32
 max_concurrent_scan_files = 384