[leo_object_storage][compaction] Grandparent objects can be removed unintentionally

[mocchira]

Now we have the following checks to validate objects in AVS
https://github.com/leo-project/leo_object_storage/blob/develop/src/leo_object_storage_transformer.erl#L535-L539
however there can be some cases where Meta#?METADATA.csize is set to a large value over ?MAX_DATABLOCK_SIZE(=10MB) when uploading a large object through multipart upload and its multipart chunk size is set to > 10MB.

So we have to increase this hard limit over a theoretical limit which can be set to multipart chunk size in any aws-client.

[mocchira]

According to https://docs.aws.amazon.com/AmazonS3/latest/dev/UploadingObjects.html, its theoretical limit is 5GB so we are going to increase MAX_DATABLOCK_SIZE to 5GB.

[mocchira]

Since we store the csize as a 32bit field into AVS, 5GB won't work due to the buffer overflow so we've decided to set MAX_DATABLOCK_SIZE to 2GB for now.

[yosukehara]

I'm going to write "MAX_DATABLOCK_SIZE to 2GB" on the documentation.

[yosukehara]

We've checked that this issue was fixed.