Compression Levels Settings for zstd and zstd_no_dict (opensearch-pro…

…ject#8312)

* Enabling compression levels as index settings

Signed-off-by: Sarthak Aggarwal <sarthagg@amazon.com>

* addressing review comments

Signed-off-by: Sarthak Aggarwal <sarthagg@amazon.com>

* refactoring codec service

Signed-off-by: Sarthak Aggarwal <sarthagg@amazon.com>

* index settings assertion

Signed-off-by: Sarthak Aggarwal <sarthagg@amazon.com>

* default compression level change in the settings

Signed-off-by: Sarthak Aggarwal <sarthagg@amazon.com>

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Signed-off-by: Sarthak Aggarwal <sarthagg@amazon.com>
(cherry picked from commit ca7045e)