Fix oci_blob to allow for blobs with size > max(i32)

[bcmyers]

Attributes of type attr.int in bazel are limited to max(i32). We use that to record the size of blobs. That means rules_oci doesn't support blobs greater than 2,147,483,647 bytes in size, which is sad.

This PR converts the size attribute on oci_blob to be an attr.string instead so that we can use arbitrarily-sized integer values.

We also had to change the name of the attribute from size to size_ because an attribute named size in bazel is special and is only allowed to be of type attr.int

[bcmyers]

• Fix oci_blob to allow for blobs with size > max(i32) #104 👈 (View in Graphite)
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