accesslog: Add AnyValue type lacks ArrayValue and KvListValue support

[shivansh-source]

kgateway version

v2.2.1

Is your feature request related to a problem? Please describe.

the Opentelemetry AnyValue implementation used in access log configuration
currently supports only StringValue but does not support ArrayValue or
KvListValue.

there is a TODO in listener_policy_types.go indicating that support for
ArrayValue and KvListValue is not yet implemented.

Describe the solution you'd like

extend AnyValue support in access log configuration to include:

• ArrayValue
• KvListValue

Describe alternatives you've considered

No response

Additional Context

the OpenTelemetry specification for AnyValue includes support for
string, bool, int, double, array, and key-value list types.
implementing ArrayValue and KvListValue would complete support for
structured attribute types in access log configuration.

[skools-here]

Hey anyone is working on this or should i pick this up?

[shivansh-source]

Waiting for maintainer to approve this so I can add a pr thank you.

[davidjumani]

Thanks @shivansh-source for reporting this. Please go ahead and raise a fix

[shivansh-source]

Got it will be working on it