Use Kibana byte formatter with ECS bytes fields (elastic#10184)

Add a Kibana field formatter to the fields that contain bytes so that they are represented in human readable format (e.g. 10 KB, 10GB).

docs/fields.asciidoc

@@ -797,6 +797,8 @@ type: long
 
 example: 184
 
+format: bytes
+
 Bytes sent from the client to the server.
 
 
@@ -1144,6 +1146,8 @@ type: long
 
 example: 184
 
+format: bytes
+
 Bytes sent from the destination to the source.
 
 
@@ -1666,6 +1670,8 @@ Mode of the file in octal representation.
 --
 type: long
 
+format: bytes
+
 File size in bytes (field is only added when `type` is `file`).
 
 --
@@ -2070,6 +2076,8 @@ type: long
 
 example: 1437
 
+format: bytes
+
 Total size in bytes of the request (body and headers).
 
 
@@ -2082,6 +2090,8 @@ type: long
 
 example: 887
 
+format: bytes
+
 Size in bytes of the request body.
 
 
@@ -2094,6 +2104,8 @@ type: long
 
 example: 1437
 
+format: bytes
+
 Total size in bytes of the response (body and headers).
 
 
@@ -2106,6 +2118,8 @@ type: long
 
 example: 887
 
+format: bytes
+
 Size in bytes of the response body.
 
 
@@ -2284,6 +2298,8 @@ type: long
 
 example: 368
 
+format: bytes
+
 Total bytes transferred in both directions.
 If `source.bytes` and `destination.bytes` are known, `network.bytes` is their sum.
 
@@ -2869,6 +2885,8 @@ type: long
 
 example: 184
 
+format: bytes
+
 Bytes sent from the server to the client.
 
 
@@ -3143,6 +3161,8 @@ type: long
 
 example: 184
 
+format: bytes
+
 Bytes sent from the source to the destination.