sdk: Apply attribute value limit for SLICE

[pellared]

Blocked by:

• attribute: Add SLICE type #7934

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

if it is an array of AnyValue, then apply the limit to each element of the array separately (and recursively),

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

[mehrdadbn9]

Hi, I'd like to work on applying attribute value limits for SLI (Service Level Indicator) metrics. This helps with cardinality control. Could a maintainer please assign it to me? Thank you!