sdk: Apply attribute value limit for BYTES

[pellared]

Blocked by:

• attribute: Add BYTES type #7933

We have to comply with SDK attribute value limit https://opentelemetry.io/docs/specs/otel/common/#attribute-limits

if it is a byte array, if its length exceeds that limit (counting each byte as 1), SDKs MUST truncate that value, so that its length is at most equal to the limit,

As of now the limits seem applicable only for span attributes.