[#1715] config: Add compression config section

To group all `compression_*` parameters together.

Change-Id: I11ad9600f731903753fef1adfbc0328ef75bbf87
Signed-off-by: Dmitrii Stepanov <d.stepanov@yadro.com>

pkg/local_object_storage/blobstor/compression/compress.go

@@ -32,8 +32,8 @@ type Config struct {
 	UncompressableContentTypes []string
 	Level                      Level
 
-	UseCompressEstimation       bool
-	CompressEstimationThreshold float64
+	EstimateCompressibility          bool
+	EstimateCompressibilityThreshold float64
 }
 
 // zstdFrameMagic contains first 4 bytes of any compressed object
@@ -101,9 +101,9 @@ func (c *Compressor) Compress(data []byte) []byte {
 	if c == nil || !c.Enabled {
 		return data
 	}
-	if c.UseCompressEstimation {
+	if c.EstimateCompressibility {
 		estimated := compress.Estimate(data)
-		if estimated >= c.CompressEstimationThreshold {
+		if estimated >= c.EstimateCompressibilityThreshold {
 			return c.compress(data)
 		}
 		return data